WordReference Random House Learner's Dictionary of American English © 2026
de•fin•ing mo•ment /dɪˈfaɪnɪŋ ˈmoʊmənt/USA pronunciation n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- a point at which the basic nature or character of a person, group, etc., is revealed or identified.
defin′ing mo′ment,
- a point at which the essential nature or character of a person, group, etc., is revealed or identified.
- 1980–85