noun

1. A polygon with four sides of equal length and four right angles; an equilateral rectangle; a regular quadrilateral.

2. Something characterized by a square, or nearly square, form.

3. An L- or T-shaped tool used to place objects or draw lines at right angles.

Synonyms: carpenter's square, framing square, steel square, hash, pound sign, sharp, piazza, plaza

verb

1. To adjust so as to align with or place at a right angle to something else; in particular:

   “The casting was mounted on a milling machine so that its sides could be squared.”

2. To resolve or reconcile; to suit or fit.

   “John can square this question up for us.”

3. To adjust or adapt so as to bring into harmony with something.

   “I cannot square the results of the experiment with my hypothesis.”

adjective

1. Shaped like a square (the polygon).

2. Forming a right angle, especially at right angles with the mast or the keel, and parallel to the horizon; said of the yards of a square-rigged vessel when they are so braced.

   “a square corner”

3. Of numbers formed by multiplying two equal numbers.

   “9 is a square number.”

Synonyms: above board, on the level, on the square, on the up and up, straight, bourgeois, normal, orthogonal