In linguistics, lenition is a sound change that alters consonants, making them more sonorous. The word ''lenition'' itself means "softening" or "weakening" (from Latin "weak"). Lenition can happen both synchronically (within a language at a particular point in time) and diachronically (as a language changes over time). Lenition can involve such changes as voicing a voiceless consonant, causing a consonant to relax occlusion, to lose its place of articulation (a phenomenon called ''debuccalization'', which turns a consonant into a glottal consonant like or ), or even causing a consonant to disappear entirely. An example of synchronic lenition is found in some dialects of American English with flapping: the of a word like ''wait'' becomes the more sonorous in the related form ''waiting'' . Some dialects of Spanish show debuccalization of to at the end of a syllable, so that a word like "we are" is pronounced . An example of diachronic lenition can be found in the Romance languages, where the of Latin ("father", accusative) has become in Italian and Spanish (the latter weakened synchronically → ), while in Catalan , French and Portuguese historical has disappeared completely. In some languages, lenition has been grammaticalized into a consonant mutation, which means it is no longer triggered by its phonological environment but is now governed by its syntactic or morphological environment. For example, in Welsh, the word "cat" begins with the sound , but after the definite article , the changes to : "the cat" in Welsh is . This was historically due to intervocalic lenition, but in the plural, lenition does not happen, so "the cats" is , not *. The change of to in is thus caused by the syntax of the phrase, not by the modern phonological position of the consonant . The opposite of lenition, fortition, a sound change that makes a consonant "stronger", is less common.


Lenition involves changes in manner of articulation, sometimes accompanied by small changes in place of articulation. There are two main lenition pathways: opening and sonorization. In both cases, a stronger sound becomes a weaker one. Lenition can be seen as a movement on the sonority hierarchy from less sonorous to more sonorous, or on a strength hierarchy from stronger to weaker. In examples below, a greater-than sign indicates that one sound changes to another. The notation > means that changes to . The sound change of palatalization sometimes involves lenition. Lenition includes the loss of a feature, such as deglottalization, in which glottalization or ejective articulation is lost: or > . The tables below show common sound changes involved in lenition. In some cases, lenition may skip one of the sound changes. The change voiceless stop > fricative is more common than the series of changes voiceless stop > affricate > fricative.


In the opening type of lenition, the articulation becomes more open with each step. Opening lenition involves several sound changes: shortening of double consonants, affrication of stops, spirantization of stops or affricates, debuccalization, and finally elision. * or > (shortening, example in some languages) * > (affrication, example in Rotokas language) * or > (spirantization, example in Gilbertese language) * > ; > (debuccalization, example in English or Spanish) * , , , , > ∅ (elision)


The sonorization type involves voicing. Sonorizing lenition involves several sound changes: voicing, approximation, and vocalization. * > (voicing, example in Korean) * > (approximation, example in Spanish) * > (vocalization) Sonorizing lenition occurs especially often intervocalically (between vowels). In this position, lenition can be seen as a type of assimilation of the consonant to the surrounding vowels, in which features of the consonant that are not present in the surrounding vowels (e.g. obstruction, voicelessness) are gradually eliminated. Some of the sounds generated by lenition are often subsequently "normalized" into related but cross-linguistically more common sounds. An example would be the changes → → and → → . Such normalizations correspond to diagonal movements down and to the right in the above table. In other cases, sounds are lenited and normalized at the same time; examples would be direct changes → or → .


''L''-vocalization is a subtype of the sonorization type of lenition. It has two possible results: a velar approximant or back vowel, or a palatal approximant or front vowel. In French, ''l''-vocalization of the sequence resulted in the diphthong , which was monophthongized, yielding the monophthong in Modern French.


Sometimes a particular example of lenition mixes the opening and sonorization pathways. For example, may spirantize or open to , then voice or sonorize to . Lenition can be seen in Canadian and American English, where and soften to a tap (flapping) when not in initial position and followed by an unstressed vowel. For example, both ''rate'' and ''raid'' plus the suffix ''-er'' are pronounced . In many British English dialects, a different lenition that affects only takes place: > (see T-glottalization). The Italian of Central and Southern Italy has a number of lenitions, the most widespread of which is the deaffrication of to between vowels: post-pausal 'dinner' but post-vocalic 'the dinner'; the name , although structurally , is normally pronounced . In Tuscany, likewise is realized between vowels, and in typical speech of Central Tuscany, the voiceless stops in the same position are pronounced respectively , as in → 'the house', → 'hole'.



Diachronic lenition is found, for example, in the change from Latin into Spanish, in which the intervocalic voiceless stops first changed into their voiced counterparts , and later into the approximants or fricatives : > , > , > , > . One stage in these changes goes beyond phonetic to have become a phonological restructuring, e.g. > (compare in Italian, with no change in the phonological status of ). The subsequent further weakening of the series to phonetic , as in is diachronic in the sense that the developments took place over time and displaced as the normal pronunciations between vowels. It is also synchronic in an analysis of as allophonic realizations of : illustrating with , 'wine' is pronounced after pause, but with intervocalically, as in 'of wine'; likewise, → . A similar development occurred in the Celtic languages, where non-geminate intervocalic consonants were converted into their corresponding weaker counterparts through lenition (usually stops into fricatives but also laterals and trills into weaker laterals and taps), and voiceless stops became voiced. For example, Indo-European intervocalic * in ''*'' "people" resulted in Proto-Celtic , Primitive Irish ''*'', Old Irish and ultimately debuccalisation in most Irish and some Scottish dialects to , shift in Central Southern Irish to , and complete deletion in some Modern Irish and most Modern Scots Gaelic dialects, thus . An example of historical lenition in the Germanic languages is evidenced by Latin-English cognates such as , , vs. ''father'', ''thin'', ''horn''. The Latin words preserved the original stops, which became fricatives in old Germanic by Grimm's law. A few centuries later, the High German consonant shift led to a second series of lenitions in Old High German, chiefly of post-vocalic stops, as evidenced in the English-German cognates ''ripe'', ''water'', ''make'' vs. , , . Although actually a much more profound change encompassing syllable restructuring, simplification of geminate consonants as in the passage from Latin to Spanish such as cuppa > 'cup' is often viewed as a type of lenition (compare geminate-preserving Italian ).



All varieties of Sardinian, with the sole exception of Nuorese, offer an example of sandhi in which the rule of intervocalic lenition applying to the voiced series /b d g/ extends across word boundaries. Since it is a fully active synchronic rule, lenition is not normally indicated in the standard orthographies. A series of synchronic lenitions involving opening, or loss of occlusion, rather than voicing is instead found for post-vocalic in many Tuscan dialects of Central Italy. Stereotypical Florentine, for example, has the of as 'house' in a post-pause realization, 'in (the) house' post-consonant, but 'the house' intervocalically. Word-internally, the normal realization is also : 'hole' → .


In the Celtic languages, the phenomenon of intervocalic lenition historically extended across word boundaries. This explains the rise of grammaticalised initial consonant mutations in modern Celtic languages through the loss of endings. A Scottish Gaelic example would be the lack of lenition in ("the man") and lenition in ("the woman"). The following examples show the development of a phrase consisting of a definite article plus a masculine noun (taking the ending ) compared with a feminine noun taking the ending . The historic development of lenition in those two cases can be reconstructed as follows: :Proto-Celtic IPA: → Old Irish → Middle Irish → Classical Gaelic → Modern Gaelic :Proto-Celtic IPA: → Old Irish → Middle Irish → Classical Gaelic → Modern Gaelic Synchronic lenition in Scottish Gaelic affects almost all consonants (except , which has lost its lenited counterpart in most areas).Oftedal, M. (1956) ''The Gaelic of Leurbost'' Norsk Tidskrift for Sporgvidenskap, Oslo Changes such as to involve the loss of secondary articulation; in addition, → involves the reduction of a trill to a tap. The spirantization of Gaelic nasal to is unusual among forms of lenition, but it is triggered by the same environment as more prototypical lenition. (It may also leave a residue of nasalization in adjacent vowels.) The orthography shows that by inserting an (except after ).

Blocked lenition

Some languages which have lenition have in addition complex rules affecting situations where lenition might be expected to occur but does not, often those involving homorganic consonants. In Scottish Gaelic, for example, there are three homorganic groups: * d n t l s (usually called the dental group in spite of the non-dental nature of the palatals) * c g (usually called the velar group) * b f m p (usually called the labial group) In a position where lenition is expected due to the grammatical environment, lenition tends to be blocked if there are two adjacent homorganic consonants across the word boundary. For example: * 'one' (which causes lenition) → 'one leg' vs 'one house' (not ) * 'on the' (which causes lenition) → 'on the big leg' vs "on the brown house" (not ) In modern Scottish Gaelic this rule is only productive in the case of dentals but not the other two groups for the vast majority of speakers. It also does not affect all environments any more. For example, while still invokes the rules of blocked lenition, a noun followed by an adjective generally no longer does so. Hence: * "hat" (a feminine noun causing lenition) → "a brown hat" (although some highly conservative speakers retain ) * "girl" (a feminine noun causing lenition) → "a smart girl" (not ) There is a significant number of frozen forms involving the other two groups (labials and velars) and environments as well, especially in surnames and place names: * 'Montgomery' ( + ) vs 'MacDonald ( + ) * 'Campbell' ( 'crooked' + 'mouth') vs 'Cameron' ( + 'nose') * 'Sgian-dubh' ( 'knife' + '1 black 2 hidden'; as a feminine noun today would normally cause lenition on a following adjective) vs "a black knife" (i.e., a common knife which just happens to be black) Though rare, in some instances the rules of blocked lenition can be invoked by lost historical consonants, for example, in the case of the past-tense copula , which in Common Celtic had a final -t. In terms of blocked lenition, it continues to behave as a dental-final particle invoking blocked lenition rules: * "bad was the food" versus 'great was the pity Blocked lenition phenomena are also known to occur in Irish and Spanish (orthographic b d g retained as following nasals rather than their normal lenited forms ).


In the modern Celtic languages, lenition of the "fricating" type is usually denoted by adding an ''h'' to the lenited letter. In Welsh, for example, , , and change into , , as a result of the so-called "aspirate mutation" (, "stone" → "her stone"). An exception is Manx orthography, which tends to be more phonetic, although in some cases etymological principles are applied. In the Gaelic script, fricating lenition (usually called simply ''lenition'') is indicated by a dot above the affected consonant, while in the Roman script, the convention is to suffix the letter to the consonant, to signify that it is lenited. Thus, is equivalent to . In Middle Irish manuscripts, lenition of and was indicated by the dot above, while lenition of , , and was indicated by the postposed ; lenition of other letters was not indicated consistently in the orthography. Voicing lenition is represented by a simple letter switch in the Brythonic languages, for instance , "stone" → , "the stone" in Welsh. In Irish orthography, it is shown by writing the "weak" consonant alongside the (silent) "strong" one: , "pen" → "our pen", , "head" → "our head" (sonorization is traditionally called "eclipsis" in Irish grammar). Although nasalization as a feature also occurs in most Scottish Gaelic dialects, it is not shown in the orthography on the whole as it is synchronic (i.e., the result of certain types of nasals affecting a following sound), rather than the diachronic Irish type sonorization (i.e., following historic nasals). For example "house" → "the house".

Consonant gradation

The phenomenon of consonant gradation in Finnic languages is also a form of lenition. An example with geminate consonants comes from Finnish, where geminates become simple consonants while retaining voicing or voicelessness (e.g. → , → ). It is also possible for entire consonant clusters to undergo lenition, as in Votic, where voiceless clusters become voiced, e.g. "to cry" → . If a language has no obstruents other than voiceless stops, other sounds are encountered, as in Finnish, where the lenited grade is represented by chronemes, approximants, taps or even trills. For example, Finnish used to have a complete set of spirantization reflexes for , though these have been lost in favour of similar-sounding phonemes. In Pohjanmaa Finnish, was changed into , thus the dialect has a synchronic lenition of an alveolar stop into an alveolar trill . Furthermore, the same phoneme undergoes assibilation → before the vowel , e.g. root "water" → and . Here, is the stem, is its nominative, and is the same stem under consonant gradation.


Fortition is the opposite of lenition: a consonant mutation in which a consonant changes from one considered weak to one considered strong. Fortition is less frequent than lenition in the languages of the world, but word-initial and word-final fortition is fairly frequent. Italian, for example, presents numerous regular examples of word-initial fortition both historically (Lat. with initial > , with ) and synchronically (e.g., "house, home" → but "at home" → ). Catalan is among numerous Romance languages with diachronic word-final devoicing ( > > . Fortition also occurs in Catalan for in consonant clusters with a lateral consonant (Lat. > or . Word-medially, is subject to fortition in numerous Romance languages, ranging from in many speech types on Italian soil to in some varieties of Spanish.

See also

* Rendaku (a similar phenomenon in the Japanese language) * Apophony * Begadkefat * Chain shift * Consonant mutation * Grimm's Law * Historical linguistics * Germanic spirant law * High German consonant shift



General references

* Crowley, Terry. (1997) ''An Introduction to Historical Linguistics.'' 3rd edition. Oxford University Press. * {{cite book| last = Oftedal| first = Magne| title = Lenition in Celtic and in insular Spanish: the secondary voicing of stops in Gran Canaria| year = 1985| publisher = Oxford University Press, USA| isbn = 8200072827 Category:Phonology Category:Linguistic morphology Category:Celtic languages