 2 definitions found
From WordNet (r) 2.0 [wn]:
parallelogram
noun: a quadrilateral whose opposite sides are both parallel and
equal in length [ant: {trapezium}]
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Parallelogram \Par'al*lel"o*gram\, noun [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}, {parallelogram of forces},
{parallelogram of accelerations}, {parallelogram of 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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