资料来源 : pyDict

一

资料来源 : Webster's Revised Unabridged Dictionary (1913)

An \An\, conj. [Shortened fr. and, OE. an., and, sometimes and
   if, in introducing conditional clauses, like Icel. enda if,
   the same word as and. Prob. and was originally pleonastic
   before the conditional clause.]
   If; -- a word used by old English authors. --Shak.

         Nay, an thou dalliest, then I am thy foe. --B. Jonson.

   {An if}, and if; if.

An \An\ ([a^]n). [AS. [=a]n one, the same word as the numeral.
   See {One}, and cf. {A}.]
   This word is properly an adjective, but is commonly called
   the indefinite article. It is used before nouns of the
   singular number only, and signifies one, or any, but somewhat
   less emphatically. In such expressions as ``twice an hour,''
   ``once an age,'' a shilling an ounce (see 2d {A}, 2), it has
   a distributive force, and is equivalent to each, every.

   Note: An is used before a word beginning with a vowel sound;
         as, an enemy, an hour. It in also often used before h
         sounded, when the accent of the word falls on the
         second syllable; as, an historian, an hyena, an heroic
         deed. Many writers use a before h in such positions.
         Anciently an was used before consonants as well as
         vowels.

资料来源 : WordNet®

AN
     n : an associate degree in nursing [syn: {Associate in Nursing}]

资料来源 : Free On-Line Dictionary of Computing

an
     
         The {country code} for the Netherlands Antilles
        (Dutch Antilles).
     
        (1999-01-27)