Adjective
era-defining (comparative more era-defining, superlative most era-defining)
epoch-making
An artisanal metalworker, Barthélemy was a radical republican inspired by memories of barely a couple of decades ago when the ordinary labouring people of Paris had once "stormed heaven" in the era-defining French Revolution. Source: Internet
The group released era-defining classics like Paranoid, War Pigs and Iron Man, and influenced the outlook of British rock music more than most bands before or since. Source: Internet