American Heritage Dictionary
(3)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
The move, described as "epochal" by media commentators, will see all Guardian content tailored to fit the format of Twitter's brief text messages, known as "tweets", which are limited to 140 characters each.— Blue Mass. Group - Front Page
Still, even without the bacon, Square One is a pretty good place - epochal breakfasts, big salads for lunch made with roasted beets or house-cured salmon, pressed ham-and-cheese sandwiches, organic grits, fragile chocolate-chip cookies as big around as dinner plates.— LA Weekly | Complete Issue
(Mandatory Canadian content obliges us to mention that Mike Weir's 2003 green jacket was also epochal, at least north of the border).
It's not a "war", and names that promote suggestions along the vein of war or some kind of epochal "struggle" should be avoided.— Macleans.ca

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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