English dictionary momentaneous meaning and definition Definition and meaning of momentaneous at MeaningMonkey.org. momentaneous meaning and definition in the English Dictionary. MOMENTANEOUS adjectiveDefinition of momentaneous (adjective)lasting for a markedly brief time"a fleeting glance"; "fugitive hours"; "rapid momentaneous association of things that meet and pass"; "a momentary glimpse"synonyms: fleeting, fugitive, momentary Source: Princeton University Wordnet
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