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A four-sided plane figure is a quadrilateral or quadrangle, sometimes also called a tetragon. It can be further classified as a rectangle or oblong, kite, rhombus, and square.

The meaning of FOUR is a number that is one more than three. How to use four in a sentence.

But now I feel like the third wheel, even though there's four of us. He’s no more than four feet tall, if that. At one point in time Kilanga was a regular mission with four American families and a medical doctor …

something representing, represented by, or consisting of four units, such as a playing card with four symbols on it

Idiom on all fours (Definition of four from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

1. The cardinal number equal to 3 + 1. 2. The fourth in a set or sequence. 3. Something having four parts, units, or members, such as a musical quartet or a four-cylinder engine.