The Collaborative International Dictionary of English v.0.48:

Elucidate \E*lu"ci*date\, v. t. [imp. & p. p. Elucidated; p.
   pr. & vb. n. Elucidating.] [LL. elucidatus, p. p. of
   elucidare; e + lucidus full of light, clear. See Lucid.]
   To make clear or manifest; to render more intelligible; to
   illustrate; as, an example will elucidate the subject.
   [1913 Webster]

WordNet (r) 3.0 (2006):

elucidate
    v 1: make clear and (more) comprehensible; "clarify the mystery
         surrounding her death" [syn: clarify, clear up,
         elucidate] [ant: obfuscate]
    2: make free from confusion or ambiguity; make clear; "Could you
       clarify these remarks?"; "Clear up the question of who is at
       fault" [syn: clear, clear up, shed light on,
       crystallize, crystallise, crystalize, crystalise,
       straighten out, sort out, enlighten, illuminate,
       elucidate]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "elucidate":
   account for, allegorize, annotate, clarify, clear, clear up, crack,
   decipher, demonstrate, demythologize, enlighten, euhemerize,
   exemplify, explain, explain away, explicate, exposit, expound,
   get across, get over, give reason for, give the meaning,
   illuminate, illustrate, make clear, make it clear, make plain,
   popularize, prove, put across, put over, rationalize,
   shed light upon, show, show how, show the way, simplify, solve,
   spell out, throw light upon, unfold, unlock, unravel, vulgarize