'Momentaneous' definitions:

Definition of 'momentaneous'

(from WordNet)
adjective
Lasting for a markedly brief time; "a fleeting glance"; "fugitive hours"; "rapid momentaneous association of things that meet and pass"; "a momentary glimpse" [syn: fleeting, fugitive, momentaneous, momentary]

Definition of 'Momentaneous'

From: GCIDE
  • Momentaneous \Mo`men*ta"ne*ous\, Momentany \Mo"men*ta*ny\, a. [L. momentaneus: cf. F. momentan['e].] Momentary. [Obs.] --Hooker. "Momentany as a sound." --Shak. [1913 Webster]