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a plane figure with four equal straight sides and four right angles.
a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.
a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides
a quadrilateral figure having two pairs of equal adjacent sides, symmetrical only about its diagonals.
a quadrilateral with only one pair of parallel sides.