1. (a.) Past; gone by.

2. (n.) Something gone by or past; a past event.

ago antiquated antique archaic belated blown over by bypast dated dead dead and buried deceased defunct departed elapsed erstwhile expired extinct finished forgotten former gone gone glimmering gone-by has-been irrecoverable lapsed late lost no more obsolete of old of yore old old-time old-timey olden oldfangled once onetime out-of-date over passe passed passed away past quondam run out sometime vanished whilom wound up