|mōmən.|tānēəs adjective
Etymology: Late Latin momentaneus, from Latin momentum moment + -aneus (as in subterraneus subterranean)
1. : momentary 1a
the rapid momentaneous association of things which meet and pass — D.H.Lawrence
2. archaic : instantaneous
in which momentaneous explosion of the whole quantity all the force consists — William Clarke
3. of an aspect or form of a verb : of, relating to, or characterizing action begun and terminated in an instant
• mo·men·ta·ne·ous·ly adverb
• mo·men·ta·ne·ous·ness noun -es