Epoch - Crossword Clue, Answer and Explanation

'epoch' is the definition.
(I know that epoch can be written as era)

This is all the clue.

(Other definitions for era that I've seen before include "Period, age" , "Important historical period" , "US equality law" , "Eon" , "Significant time" .)

I've seen this clue in The Guardian, the Penny Press, the Sydney Morning Herald, the Evening Standard, The Sun, the King Feature Syndicate, the Newsday, The Wall Street Journal, The Mirror, The Telegraph and The Star Tribune.

'epoch' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for age that I've seen before include "Get old" , "it improves wine" , "Period of time" , "Historic period" , "Mature, grow in years" .)

I've seen this clue in The Guardian, the Penny Press, the Sydney Morning Herald, the Evening Standard, The Sun, the King Feature Syndicate, the Newsday, The Wall Street Journal, The Mirror, The Telegraph and The Star Tribune.

'epoch' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for aeon that I've seen before include "Epoch" , "Vast time period" , "Indefinitely long period of time" , "An immense period of time" , "An age; period" .)

I've seen this clue in The Telegraph.

Epoch (3)