The Collaborative International Dictionary of English v.0.48:
Mayhap \May"hap\, adv. Perhaps; peradventure. [Prov. or Dialectic] [1913 Webster]WordNet (r) 3.0 (2006):
mayhap adv 1: 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]