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    1. A
    2. n. noun

      • 1. the first letter of the alphabet.

      • 2. denoting the first in a set of items, categories, sizes, etc.

      • 3. denoting the first of two or more hypothetical people or things:

        suppose A had killed B
      • 4. the highest class of academic mark.

      • 5. denoting the first file from the left, as viewed from white's side of the board.

      • 6. the first fixed quantity in an algebraic expression.

      • 7. the human blood type (in the ABO system) containing the A agglutinogen and lacking the B.

      • 8. a shape like that of a capital A:

        an A-shape
      • 9. the sixth note of the diatonic scale of C major.

      • 10. a key based on a scale with A as its keynote.

    3. Variation

      • n.: noun: A, plural noun: A's

    4. a

      • det.

        used when referring to someone or something for the first time in a text or conversation:

        used with units of measurement to mean one such unit:


      • abbreviation

        ace (used in describing play in bridge and other card games):


      • prefix字首

        to; toward:

        in a specified state or manner:

      • suffix字尾

        ancient or Latinized modern names of animals and plants:

        names of oxides:

      • suffix字尾



      • suffix字尾

        from Greek or Latin neuter plurals corresponding to a singular in -um or -on (such as addenda, phenomena).

        in names (often from modern Latin) of zoological groups:

      • prefix字首



      • prefix字首

        not; without:
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