A-2 Jacket Contract List
A- or a- may refer to: ;A-hyphen * A- (plane), a U.S. military aircraft prefix * Privative a, a prefix expressing negation * Copulative a, a prefix expressing unification ;A-minus * A−, a blood type A blood type (also known as a blood group) is based on the presence and absence of antibody, antibodies and Heredity, inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycop ... * A− (grade), an educational grade in the letter-grading system, above B+ but below A See also * Ā {{Disambiguation ...
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A- (plane)
An attack aircraft, strike aircraft, or attack bomber is a tactical military aircraft that has a primary role of carrying out airstrikes with greater precision than bombers, and is prepared to encounter strong low-level air defenses while pressing the attack.Mortensen 1987, pp. 24–25. This class of aircraft is designed mostly for close air support and naval air-to-surface missions, overlapping the tactical bomber mission. Designs dedicated to non-naval roles are often known as ground-attack aircraft.Gunston 2009, p. 73. Fighter aircraft often carry out the attack role, although they would not be considered attack aircraft ''per se''; fighter-bomber conversions of those same aircraft would be considered part of the class. Strike fighters, which have effectively replaced the fighter-bomber and light bomber concepts, also differ little from the broad concept of an attack aircraft. The dedicated attack aircraft as a separate class existed primarily during and after World War II ...
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Privative A
An alpha privative or, rarely, privative a (from Latin ', from Ancient Greek ) is the prefix ''a-'' or ''an-'' (before vowels) that is used in Indo-European languages such as Sanskrit and Greek and in words borrowed therefrom to express negation or absence, for example the English words of Greek origin '' atypical'', '' anesthetic'', and '' analgesic'', as well as the English word of Sanskrit origin ''ahimsa'' (''ahinsa''). It is derived from a Proto-Indo-European syllabic nasal *', the zero ablaut grade of the negation *', i.e. /n/ used as a vowel. For this reason, it usually appears as ' before vowels (e.g. '' an-alphabetism'', '' an-esthesia'', '' an-archy''). It shares the same root with the Greek prefix ' or ', in Greek or , that is also privative (e.g. '). It is not to be confused with, among other things, an alpha copulative (e.g. '' a-delphós'') or the prefix ' (i.e. the preposition ' with ecthlipsis or elision of its final vowel before a following vowel; e.g. '). ...
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Copulative A
Copulative may refer to: * Copula (linguistics), a part of speech * Copulation (zoology) In zoology, copulation is animal sexual behavior in which a male introduces sperm into the female's body, especially directly into her reproductive tract. This is an aspect of mating. Many aquatic animals use external fertilization, whereas ...

Blood Type
A blood type (also known as a blood group) is based on the presence and absence of antibody, antibodies and Heredity, inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. Some of these antigens are also present on the surface of other types of Cell (biology)#Eukaryotic cells, cells of various Tissue (biology), tissues. Several of these red blood cell surface antigens can stem from one allele (or an alternative version of a gene) and collectively form a blood group system. Blood types are inherited and represent contributions from both parents of an individual. As of October 2024, a total of 47 human blood group systems are recognized by the International Society of Blood Transfusion (ISBT). The two most important blood group systems are ABO blood group system, ABO and Rh blood group system, Rh; they determine someone's blood type (A, B, AB, and O ...
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A− (grade)
This is a list of grading systems used by countries of the world, primarily within the fields of secondary education and university education, organized by continent with links to specifics in numerous entries. Africa Angola The grading system depends on the districts in Angola. However, this is the most common used grading system: All schools in Angola have 6 tiers and are given based on student's performance. Kenya The grading system employed throughout Kenya differs based on the level of institution. The secondary school grading system ranges from grade A to E with grade thresholds changing each year depending on the intensity of the exam. Institutes and colleges award the results of examinations depending on the KNEC grading system in 4 classes (Distinction, Credit, Pass, Fail) with 7 grades of 1 to 7. The university grading system awards degrees in terms of class (First Class, Second Class - Upper Division, Second Class - Lower Division and Pass Class). A breakdo ...
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