Etymology
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momentary (adj.)

"lasting but a moment, of short duration," mid-15c., momentare, from Late Latin momentarius "of brief duration," from Latin momentum "a short time, an instant" (see moment).

updated on February 13, 2019

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Definitions of momentary from WordNet

momentary (adj.)
lasting for a markedly brief time;
a momentary glimpse
Synonyms: fleeting / fugitive / momentaneous
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.