adj. 25B6; adjective SIGNIFICANT, notable, important, momentous, consequential, memorable, unforgettable, remarkable; famous, famed, celebrated, renowned; landmark, ground-breaking, epoch-making, red-letter; informal earth-shattering.
insignificant.
HISTORIC
Meaning of HISTORIC in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012