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A

A 1 / ā / (also a ) • n.( pl. As or A's ) 1. the first letter of the alphabet. ∎  denoting the first in a set of items, categories, sizes, etc. ∎  denoting the first of two or more hypothetical people or things: suppose A had killed B. ∎  the highest class of academic mark. ∎  (usu. a )the first fixed quantity in an algebraic expression. ∎  ( A )the human blood type (in the ABO system) containing the A agglutinogen and lacking the B. 2. a shape like that of a capital A:[in combination ] an A-shape. See also A-frame , A-line . 3. Music the sixth note of ...

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