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The Collaborative International Dictionary
Momental

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.

Wiktionary
momental

a. 1 (context obsolete English) Lasting only for a moment; brief. 2 (context obsolete English) important; momentous 3 (context obsolete engineering English) Of or relating to moment or momentum.