Google - what is an another word that describes the following: a significant memory?

Hey all,A word is on the tip of my tongue, but I cant seem to think of the word. It is a work that describes a significant memory that changed my life

Hey all,

A word is on the tip of my tongue, but I can't seem to think of the word. It is a work that describes a significant memory that changed my life...

Thanks!

or:Hey all,A word is on the tip of my tongue, but I can't seem to think of the word. It is a work that describes a significant memory that changed my life...Thanks!

or:Epiphany.a (1) : a usually sudden manifestation or perception of the essential nature or meaning of something.(2) : an intuitive grasp of reality through something (as an event) usually simple and striking.(3) : an illuminating discovery, realization, or disclosure.b : a revealing scene or moment.

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