| n. | 1. | (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.
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| Noun | 1. | parallelogram - a quadrilateral whose opposite sides are both parallel and equal in lengthAntonyms: trapezium - a quadrilateral with no parallel sides |
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