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.

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

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

Buy now, pay later at hundreds of online retailers. Split your purchase into 4 easy payments—paid every two weeks—so you can shop what you love while staying on budget. Manage every order in one …

Apr 15, 2026 · Describing a set or group with four elements. four (countable and uncountable, plural fours) (countable) The digit or figure 4; an occurrence thereof. (countable) Anything measuring four …

Four is the second square number (a "square number" is an integer that can be written as the square of some other integer) and the second centered triangular number.

/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, …