Answer:

epochal

Answer	Crossword Clue
EPOCHAL	Momentous
EPOCHAL	Very influential
EPOCHAL	Historically significant

EPOCHAL	Earth-shattering
EPOCHAL	Highly significant
EPOCHAL	Of a historic interval
EPOCHAL	Of a time period
EPOCHAL	Extremely important
EPOCHAL	Extremely significant
EPOCHAL	Of a historic period
EPOCHAL	Era-defining

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.