The Collaborative International Dictionary of English v.0.48:

Elope \E*lope"\, v. i. [imp. & p. p. Eloped; p. pr. & vb. n.
   Eloping.] [D. ontloopen to run away; pref. ont- (akin to G.
   ent-, AS. and-, cf. E. answer) + loopen to run; akin to E.
   leap. See Leap, v. t.]
   To run away, or escape privately, from the place or station
   to which one is bound by duty; -- said especially of a woman
   or a man, either married or unmarried, who runs away with a
   paramour or a sweetheart.
   [1913 Webster]

         Great numbers of them [the women] have eloped from
         their allegiance.                        --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

elope
    v 1: run away secretly with one's beloved; "The young couple
         eloped and got married in Las Vegas" [syn: elope, run
         off]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "elope":
   abscond, absquatulate, beat a retreat, bolt, clear out,
   cut and run, decamp, depart, desert, flee, fly, fugitate, go AWOL,
   jump, jump bail, levant, make off, run, run away, run away from,
   run away with, run for it, run off, show the heels, skedaddle,
   skip, skip out, slip the cable, take French leave, take flight,
   take to flight, take wing, turn tail