2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Momentum \Mo*men"tum\, n.; pl L. {Momenta}, F. {Momentums}. [L.
See {Moment}.]
1. (Mech.) 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.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Parallelogram \Par`al*lel"o*gram\, n. [Gr. ?; ? parallel + ? to
write: cf F. parall['e]logramme. See {Parallel}, and
{-gram}.] (Geom.)
A right-lined quadrilateral figure, whose opposite sides are
parallel, and consequently equal; -- sometimes restricted in
popular usage to a rectangle, or quadrilateral figure which
is longer than it is broad, and with right angles.
{Parallelogram of velocities}, {forces}, {accelerations},
{momenta}, etc (Mech.), a parallelogram the diagonal of
which represents the resultant of two velocities, forces,
accelerations, momenta, etc., both in quantity and
direction, when the velocities, forces, accelerations,
momenta, etc., are represented in quantity and direction
by the two adjacent sides of the parallelogram.
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