adj.
Pronunciation: ' e-p ə -k ə l, ' e- ˌ pä-k ə l
Function: adjective
Date: 1685
1 : of or relating to an epoch
2 : uniquely or highly significant : MOMENTOUS <during his three epochal years in the assembly ― C. G. Bowers> also : UNPARALLELED < epochal stupidity>
– ep · och · al · ly adverb