[syn: possibly, perchance, perhaps, maybe, mayhap, peradventure]
The Collaborative International Dictionary of English v.0.48:
Perchance \Per*chance"\ (p[~e]r*ch[.a]ns"), adv. [F. par by (L.
   per) + chance. See Par, and Chance.]
   By chance; perhaps; peradventure.
   [1913 Webster]
WordNet (r) 3.0 (2006):
perchance
    adv 1: through chance, "To sleep, perchance to dream.." [syn:
           perchance, by chance]
    2: by chance; "perhaps she will call tomorrow"; "we may possibly
       run into them at the concert"; "it may peradventure be
       thought that there never was such a time" [syn: possibly,
       perchance, perhaps, maybe, mayhap, peradventure]
Moby Thesaurus II by Grady Ward, 1.0:
23 Moby Thesaurus words for "perchance":
   accidentally, as it chanced, by a fluke, by accident, by chance,
   by good fortune, by hazard, casually, conceivably, feasibly,
   for some reason, fortuitously, haply, imaginably, in some way,
   incidentally, it may be, maybe, perhaps, possibly, somehow,
   somehow or other, unpredictably