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From: Webster's Revised Unabridged Dictionary (1913)

 Mo·men·tum n.; pl. L. Momenta F. Momentums
 1. Mech. The quantity of motion in a moving body, being always proportioned to the quantity of matter multiplied by the velocity; impetus.
 2. Essential element, or constituent element.
    I shall state the several momenta of the distinction in separate propositions.   --Sir W. Hamilton.