noun
a four-sided polygon
adjective
relating to or having four sides
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A quadrilateral is a polygon with four sides and four angles.
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Hey, did you know that a quadrilateral is just a fancy word for a four-sided shape?
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I aced that math test because I knew how to classify a quadrilateral.
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The team's strategy was like a quadrilateral, with each side representing a different aspect of the plan.