epochal

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

adjective highly significant or important especially bringing about or marking the beginning of a new development or era

From epoch + -al.

How men merge down into the conventional in their more epochal moments! — The Prairie Wife, Arthur Stringer
On the epochal Theory of Relativity have arisen the mathematical possibilities of exploring the ultimate atom. — Autobiography of a Yogi, Paramahansa Yogananda
And so this epochal phase of my life had come to a triumphant close; possessed of "Hildebrand Hundred," a son to inherit my name, and the best wife in the world. — In Jeopardy, Van Tassel Sutphen

epoch-making

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