HAP Meaning of HAP in English n. & v. archaic n. 1 chance, luck. 2 a chance occurrence. v.intr. (happed, happing) 1 come about by chance. 2 (foll. by to + infin.) happen to. [ ME f. ON happ ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012