Definition of momentaneousness in English:

momentaneousness

noun

  • The state or quality of being momentaneous; instantaneousness.

Origin

Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From momentaneous + -ness.

Pronunciation

momentaneousness

/ˌməʊm(ə)nˈteɪnɪəsnəs/