Momentum
Pronunciation : Mo*men"tum, n.; pl. L. Momenta
Part of Speech : F.
Etymology : [L. See Moment.]
Definition : 1. (Mech.)
Defn: The quantity of motion in a moving body, being always proportioned to the quantity of matter multiplied into the velocity; impetus.
2. Essential element, or constituent element. I shall state the several momenta of the distinction in separate propositions. Sir W. Hamilton.
Momentums.
Source : Webster's Unabridged Dictionary, 1913