4 - Wikipedia
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.

FOUR Definition & Meaning - Merriam-Webster
The meaning of FOUR is a number that is one more than three. How to use four in a sentence.

FOUR definition in American English | Collins English Dictionary
something representing, represented by, or consisting of four units, such as a playing card with four symbols on it

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

Four Definition & Meaning - YourDictionary
Four definition: The cardinal number equal to 3 + 1.

four - Wiktionary, the free dictionary
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 units, as length. Do you have any more fours? I want to make this a little taller.

four - WordReference.com Dictionary of English
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 noun] amounting to four in number. Idioms on all fours, on one's hands and knees.

Four - definition of four by The Free Dictionary
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.

Four - Definition, Meaning & Synonyms | Vocabulary.com
It was twice the width of any human book and four times as tall. It was more than I had ever spun at once, maybe three or four mattresses full.

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