(adj)
having four equal sides and four right angles or forming a right angle; "a square peg in a round hole"; "a square corner"

providing abundant nourishment; "a hearty meal"; "good solid food"; "ate a substantial breakfast"; "four square meals a day"

without evasion or compromise; "a square contradiction"; "he is not being as straightforward as it appears"

firmly and solidly; "hit the ball squarely"; "the bat met the ball squarely"; "planted his great bulk square before his enemy"

(noun)
(geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon; "you can compute the area of a square if you know the length of its sides"

the product of two equal terms; "nine is the second power of three"; "gravity is inversely proportional to the square of the distance"

any artifact having a shape similar to a plane geometric figure with four equal sides and four right angles; "a checkerboard has 64 squares"

a hand tool consisting of two straight arms at right angles; used to construct or test right angles; "the carpenter who built this room must have lost his square"

be compatible with; "one idea squares with another"

turn the paddle; in canoeing