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.

Remember, zero is the same as none. Let's clap and count together back up to four. 1, 2, 3, 4! Now, point at the number 4, and use your finger to trace it in the air. Here we go!

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

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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.

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

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2 days ago · 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 …