epoch-making
Speech parts
1. epoch-making - Adjective
2. epoch-making - Adjective Satellite
Meaning
highly significant or important especially bringing about or marking the beginning of a new development or era
Source: WordNetSynonyms
Examples
It is an absolutely unique success of the church community to have introduced such an epoch-making change, in just a few years, without having a serious division.
We shall be inclined to pronounce the voyage that led to the way to this New World as the most epoch-making event of all that have occurred since the birth of Christ.
epochal decisions made by Roosevelt and Churchill
an epoch-making discovery
Anyway, congratulations to Known Person Senator Patrick Leahy for his epoch-making burn.
Covid-19 is an epoch-making event, but will it drive us towards the precipice of history?