The Collaborative International Dictionary of English v.0.48:

Eliminate \E*lim"i*nate\, v. t. [imp. & p. p. Eliminated; p.
   pr. & vb. n. Eliminating.] [L. eliminatus, p. p. of
   eliminare; e out + limen threshold; prob. akin to limes
   boundary. See Limit.]
   1. To put out of doors; to expel; to discharge; to release;
      to set at liberty.
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            Eliminate my spirit, give it range
            Through provinces of thought yet unexplored.
                                                  --Young.
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   2. (Alg.) To cause to disappear from an equation; as, to
      eliminate an unknown quantity.
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   3. To set aside as unimportant in a process of inductive
      inquiry; to leave out of consideration.
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            Eliminate errors that have been gathering and
            accumulating.                         --Lowth.
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   4. To obtain by separating, as from foreign matters; to
      deduce; as, to eliminate an idea or a conclusion. [Recent,
      and not well authorized]
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   5. (Physiol.) To separate; to expel from the system; to
      excrete; as, the kidneys eliminate urea, the lungs
      carbonic acid; to eliminate poison from the system.
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WordNet (r) 3.0 (2006):

eliminate
    v 1: terminate, end, or take out; "Let's eliminate the course on
         Akkadian hieroglyphics"; "Socialism extinguished these
         archaic customs"; "eliminate my debts" [syn: extinguish,
         eliminate, get rid of, do away with]
    2: do away with [syn: obviate, rid of, eliminate] [ant:
       ask, call for, demand, involve, necessitate,
       need, postulate, require, take]
    3: kill in large numbers; "the plague wiped out an entire
       population" [syn: eliminate, annihilate, extinguish,
       eradicate, wipe out, decimate, carry off]
    4: dismiss from consideration or a contest; "John was ruled out
       as a possible suspect because he had a strong alibi"; "This
       possibility can be eliminated from our consideration" [syn:
       rule out, eliminate, winnow out, reject]
    5: eliminate from the body; "Pass a kidney stone" [syn:
       excrete, egest, eliminate, pass]
    6: remove from a contest or race; "The cyclist has eliminated
       all the competitors in the race"
    7: remove (an unknown variable) from two or more equations