ep·och·al

[ep-uh-kuhl or, esp. British, ee-po-]
adjective
1.
of, pertaining to, or of the nature of an epoch.
2.
extremely important, significant, or influential.

Origin:
1675–85; epoch + -al1

ep·och·al·ly, adverb
non·ep·och·al, adjective
pre·ep·och·al, adjective
un·ep·och·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
epoch (ˈiːpɒk) [Click for IPA pronunciation guide]
 
n
1.  a point in time beginning a new or distinctive period: the invention of nuclear weapons marked an epoch in the history of warfare
2.  a long period of time marked by some predominant or typical characteristic; era
3.  astronomy a precise date to which information, such as coordinates, relating to a celestial body is referred
4.  geology a unit of geological time within a period during which a series of rocks is formed: the Pleistocene epoch
5.  physics the displacement of an oscillating or vibrating body at zero time
 
[C17: from New Latin epocha, from Greek epokhē cessation; related to ekhein to hold, have]
 
epochal
 
adj
 
'epochally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Epochal is always a great word to know.
So is bezoar. Does it mean:
a fool or simpleton; ninny.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
To see why, consider another epochal shift in the development of a rising
  economic power.
The impact of this epochal shift will be as strong on universities and their
  students as on society as a whole.
Others explain it as the result of epochal social change and the loss of moral
  ballast once supplied by communist ideology.
Considering the period in which it was developed, the idea of fish farming
  should be esteemed highly as an epochal accomplishment.
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