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.

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

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

Definition of four in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

/fɔ/ IPA guide Other forms: fours Definitions of four noun the cardinal number that is the sum of three and one synonyms: 4, IV, Little Joe, foursome, quadruplet, quartet, quatern, quaternary, quaternion, …

WordReference Random House Learner's Dictionary of American English © 2025 four /fɔr/ n. [countable] a cardinal number, three plus one. a symbol for this number, as 4 or IV. adj. [before a …