mayhap

from 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}]

from The Collaborative International Dictionary of English v.0.48

Mayhap \May"hap\, adv.
   Perhaps; peradventure. [Prov. or Dialectic]
   [1913 Webster]