Substitution may refer to:

Arts and media

* Substitution (poetry), a variation in poetic scansion * Substitution (theatre), an acting methodology

Music

* Chord substitution, swapping one chord for a related one within a chord progression * Tritone substitution, reinterpreting a chord via a new root note located an augmented fourth or diminished fifth distant from the root of the original interpretation * "Substitution" (Silversun Pickups song), a 2009 song by Silversun Pickups * "Substitution" (Purple Disco Machine and Kungs song), a 2023 song by

Purple Disco Machine Tino Piontek (born 12 February 1980), better known by the stage name Purple Disco Machine, is a German nu-disco and house music record producer and Disc jockey, DJ. Early life and career Tino Piontek was born in Dresden on 12 February 1980, an ...

and Kungs

Science and mathematics

Biology and chemistry

* Base-pair substitution or point mutation, a type of mutation * Substitution reaction, where a functional group in a chemical compound is replaced by another group **

Substituent In organic chemistry, a substituent is one or a group of atoms that replaces (one or more) atoms, thereby becoming a moiety in the resultant (new) molecule. The suffix ''-yl'' is used when naming organic compounds that contain a single bond r ...

, the atom or atoms that replaces those of the reactant *Substitution, a process in which an allele arises and undergoes fixation

Mathematics and computing

* Substitution (algebra), replacing occurrences of some symbol by a given value *

Substitution (logic) A substitution is a syntactic transformation on formal expressions. To ''apply'' a substitution to an expression means to consistently replace its variable, or placeholder, symbols with other expressions. The resulting expression is called a ''s ...

, a syntactic transformation on strings of symbols of a formal language * String substitution, a mapping of letters in an alphabet to languages * Substitution of a character in a string, one of the single-character edits used to define the Levenshtein distance *

Substitution cipher In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, t ...

, a method of encryption *

Integration by substitution In calculus, integration by substitution, also known as ''u''-substitution, reverse chain rule or change of variables, is a method for evaluating integrals and antiderivatives. It is the counterpart to the chain rule for differentiation, and c ...

, a method for finding antiderivatives and integrals

Other uses in science

* Substitution (economics), switching between alternative consumable goods as their relative prices change *

Attribute substitution Attribute substitution is a psychological process thought to underlie a number of cognitive biases and perceptual illusions. It occurs when an individual has to make a judgment (of a ''target attribute'') that is computationally complex, and ins ...

, a psychological process thought to underlie a number of cognitive biases and perceptual illusions * Substitution method, a method of measuring the transmission loss of an optical fiber

Other uses

* Substitution (law), the replacement of a judge *

Substitution (sport) In team sports, substitution (or interchange) is replacing one player with another during a match. Substitute players that are not in the starting lineup (also known as bench players, backups, interchange, or reserves) reside on the bench and are ...

, where a sports team is able to change one player for another during a match * Substitution therapy or opiate replacement therapy *

Import substitution industrialization Import substitution industrialization (ISI) is a protectionist trade and economics, economic policy that advocates replacing foreign imports with domestic production. It is based on the premise that a country should attempt to reduce its foreign ...

, a trade and economic policy * Penal substitution, a theory of the atonement within Christian theology *

Simultaneous substitution Simultaneous substitution (also known as simsubbing or signal substitution) is a practice mandated by the Canadian Radio-television and Telecommunications Commission (CRTC) requiring pay television, broadcast distribution undertakings (BDUs) in ...

, a practice requiring Canadian television distribution companies to substitute a non-local station signal with the local signal

Within Wikipedia

* Help:Substitution, help performing substitution on Wikipedia pages * Special:ExpandTemplates, page that shows what will result from substitution * Wikipedia:Substitution, where, when, how, and what about using substitution on Wikipedia