The Collaborative International Dictionary of English v.0.48:

Each \Each\ ([=e]ch), a. or a. pron. [OE. eche, [ae]lc, elk,
   ilk, AS. [ae]lc; [=a] always + gel[imac]c like; akin to OD.
   iegelik, OHG. [=e]ogil[imac]h, MHG. iegel[imac]ch, G.
   jeglich. [root]209. See 3d Aye, Like, and cf. Either,
   Every, Ilk.]
   1. Every one of the two or more individuals composing a
      number of objects, considered separately from the rest. It
      is used either with or without a following noun; as, each
      of you or each one of you. "Each of the combatants."
      --Fielding.
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   Note: To each corresponds other. "Let each esteem other
         better than himself." Each other, used elliptically for
         each the other. It is our duty to assist each other;
         that is, it is our duty, each to assist the other, each
         being in the nominative and other in the objective
         case.
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               It is a bad thing that men should hate each
               other; but it is far worse that they should
               contract the habit of cutting one another's
               throats without hatred.            --Macaulay.
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               Let each
               His adamantine coat gird well.     --Milton.
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               In each cheek appears a pretty dimple. --Shak.
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               Then draw we nearer day by day,
               Each to his brethren, all to God.  --Keble.
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               The oak and the elm have each a distinct
               character.                         --Gilpin.
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   2. Every; -- sometimes used interchangeably with every.
      --Shak.
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            I know each lane and every alley green. --Milton.
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            In short each man's happiness depends upon himself.
                                                  --Sterne.
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   Note: This use of each for every, though common in Scotland
         and in America, is now un-English. --Fitzed. Hall.

   Syn: See Every.
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WordNet (r) 3.0 (2006):

each
    adv 1: to or from every one of two or more (considered
           individually); "they received $10 each" [syn: each, to
           each one, for each one, from each one, apiece]
    adj 1: (used of count nouns) every one considered individually;
           "each person is mortal"; "each party is welcome"

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "each":
   all, all and some, all and sundry, any, apiece, aside,
   each and all, each and every, each one, each to each, every,
   every one, one and all, one by one, particular, per, per annum,
   per capita, respective, respectively, several, severally, specific,
   various