Source : Webster's Revised Unabridged Dictionary (1913)

Haply \Hap"ly\, adv.
   By hap, chance, luck, or accident; perhaps; it may be.

         Lest haply ye be found even to fight against God.
                                                  --Acts v. 39.

Source : WordNet®

haply
     adv : by accident; "betrayed by a word haply overheard" [syn: {by
           chance}, {by luck}]