Source : Webster's Revised Unabridged Dictionary (1913)

Momental \Mo*men"tal\, a. [Cf. OF. momental.] [Obs.]
   1. Lasting but a moment; brief.

            Not one momental minute doth she swerve. --Breton.

   2. Important; momentous.

   3. (Mech.) Of or pertaining to moment or momentum.