1. Having four equal sides and four right angles or forming a right angle
2. Characterized by honesty and fairness; SYN. straight.
3. Without evasion or compromise; SYN. straightforward.
4. (Informal) Leaving no balance
5. (Slang) Rigidly conventional or old-fashioned; SYN. straight.

(Geometry) A plane rectangle with four equal sides and four right angles; a four-sided regular polygon; SYN. foursquare.
In geometry, a quadrilateral (four-sided) plane figure with all sides equal and each angle a right angle. Its diagonals bisect each other at right angles. The area A of a square is the length l of one side multiplied by itself (a = l x l).
Also, any quantity multiplied by itself is termed a square, represented by an exponent of power 2; for example, 4 x 4 = 42 = 16 and 6.8 x 6.8 = 6.82 = 46.24.
An algebraic term is squared by doubling its exponent and squaring its coefficient if it has one; for example, (x2)2 = x4 and (6y3)2 = 36y6. A number that has a whole number as its square root is known as a perfect square; for example, 25, 144 and 54,756 are perfect squares (with roots of 5, 12 and 234, respectively).

ETYM Old Fren. esquarre, esquierre, French équerre a carpenter's square (cf. Italian squadra), from (assumed) Late Lat. exquadrare to make square; Latin ex + quadrus a square, from quattuor four. Related to Four, Quadrant, Squad, Squer a square.
1. (Informal) A formal and conservative person with old-fashioned views; SYN. square toes.
2. A tool consisting of two straight arms at right angles; used to construct or test right angles.
3. Any object having a shape similar to a plane geometric figure with four equal sides and four right angles.
4. The product of two equal terms; SYN. second power.

1. To make square; SYN. square up.
2. To position so as to be square:
3. To be compatible with
4. To cause to match, as of ideas or acts.
5. To pay someone and settle a debt
6. To raise to the second power