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.

There were four families in the camp, but most of the older warriors were back at the village seeing their girlfriends and getting their hair braided. It’s getting close to four, and we do have school in the morning.

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

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

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.

Jan 24, 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 …

For is a preposition used to indicate purpose, destination, or a period of time, often associated with the expression of reasoning or as part of idiomatic expressions. On the other hand, four is the number 4, …

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.