Epochal (adjective)

Relating to an epoch, a distinct period of time marked by significant events, changes, or developments.

Origin:

From the greek epokhē "a fixed point in time, era".

Examples:

1. The invention of the printing press was an epochal event in human history.
2. The Industrial Revolution was an epochal change in the way goods were produced.
3. The fall of the Berlin Wall was an epochal moment in history.
4. Epochal events are significant events that mark a new era.
5. The discovery of DNA structure was an epochal event in the field of biology.