This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or characteristic of an epoch.

adj. Highly significant or important; momentous: epochal decisions made by Roosevelt and Churchill.

adj. Without parallel: epochal stupidity.

adj. of or pertaining to an epoch

adj. highly important or significant; monumentous, epoch-making

adj. Belonging to an epoch; of the nature of an epoch.

Belonging to an epoch; of the nature of an epoch; relating to epochs; marking an epoch.

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

"The word epochal is overstated, but it felt like it then and it has subsequently proved to be that."

significant    important   

mirth-provoking    psychohistoric    cataclysmic    resectable    cancer-causing    nephrotoxic    shallow-minded    all-or-nothing    world-shaking    pro-war