epoch
These people left very little evidence of their everyday lives in an epochally turbulent time.
These plans are important if we want to epochally improve people's standard of living.
The party is demanding nothing less than an epochally new way of thinking about welfare.

SMART Vocabulary: related words and phrases

Very important or urgent
all-important
at all costsidiom
be a matter of life and/or deathidiom
cardinally
chief
imperative
last but not leastidiom
leading
life-altering
life-and-death
life-changing
overriding
primary
prime
principally
prior
prized
seminal
tectonic
weighty