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. From bing.com
FOUR - DEFINITION, PICTURES, PRONUNCIATION AND USAGE NOTES | OXFORD ...
Definition of four in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. From bing.com
FOUR DEFINITION AND MEANING | COLLINS ENGLISH DICTIONARY
Judith is married with four children. In cricket, if a player hits a four, they score four runs by hitting the ball along the ground so that it crosses the boundary at the edge of the playing area. … From bing.com
Something having four parts, units, or members, such as a musical quartet or a four-cylinder engine. All four limbs of an animal or person: a baby crawling on all fours. [Middle English, … From bing.com
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in … From bing.com
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