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)

Mar 20, 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 …

Aristotle explained natural processes in terms of four causes: formal, final, material and efficient. Built four years earlier in 1915, the tank stood fifty feet high and ninety feet wide.

FOUR definition: a cardinal number, three plus one. See examples of four used in a sentence.

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