The Collaborative International Dictionary of English v.0.48:

Elimination \E*lim`i*na"tion\, n. [Cf. F. ['e]limination.]
   1. The act of expelling or throwing off; (Physiol.) the act
      of discharging or excreting waste products or foreign
      substances through the various emunctories.
      [1913 Webster]

   2. (Alg.) Act of causing a quantity to disappear from an
      equation; especially, in the operation of deducing from
      several equations containing several unknown quantities a
      less number of equations containing a less number of
      unknown quantities.
      [1913 Webster]

   3. The act of obtaining by separation, or as the result of
      eliminating; deduction. [See Eliminate, 4.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

elimination
    n 1: the act of removing or getting rid of something [syn:
         elimination, riddance]
    2: the bodily process of discharging waste matter [syn:
       elimination, evacuation, excretion, excreting,
       voiding]
    3: analysis of a problem into alternative possibilities followed
       by the systematic rejection of unacceptable alternatives
       [syn: elimination, reasoning by elimination]
    4: the act of removing an unknown mathematical quantity by
       combining equations
    5: the murder of a competitor [syn: elimination,
       liquidation]