A square is a figure with four equal sides and four right angles. It's a popular shape for windows and record albums, among many other things.
Square has many different metaphorical uses. Old towns had square open areas for meetings, so now "town square" means meeting place, even if it's not shaped exactly like a square. If you settle your debts, you square them, and if someone calls you a square, they mean you're boring, ruleabiding, and lame. In math, a square is the product of something multiplied by itself. If you square your plans with someone, you line them up.
Primary Meanings of square
1. 
nadjadvv 
(geometry) a plane rectangle with four equal sides and four right angles; a foursided regular polygon
having four equal sides and four right angles or forming a right angle
in a square shape
make square

2. 
n 
a hand tool consisting of two straight arms at right angles; used to construct or test right angles

3. 
nv 
the product of two equal terms
raise to the second power

4. 
adjadv 
characterized by honesty and fairness
in a straight direct way

5. 
nadj 
a formal and conservative person with oldfashioned views
rigidly conventional or oldfashioned

6. 
adjv 
leaving no balance
pay someone and settle a debt

7. 
adj 
providing abundant nourishment

8. 
v 
turn the oar, while rowing

Full Definitions of square
1
n (geometry) a plane rectangle with four equal sides and four right angles; a foursided regular polygon
“you can compute the area of a
square if you know the length of its sides”
 Synonyms:
 foursquare
 Types:

quadrate
a squareshaped object
 Type of:

regular polygon
a polygon with all sides and all angles equal

rectangle
a parallelogram with four right angles
n something approximating the shape of a square
n an open area at the meeting of two or more streets
 Synonyms:
 public square
 Examples:

Trafalgar Square
a square in central London where there is a memorial to Admiral Nelson
 Type of:

parcel, parcel of land, piece of ground, piece of land, tract
an extended area of land
adj having four equal sides and four right angles or forming a right angle
“a
square peg in a round hole”
“a
square corner”
 Synonyms:

quadrate
having four sides and four angles

rightangled
forming a right angle or containing one or more right angles

squared
having been made square

squarish
somewhat square in appearance or form

angular, angulate
having angles or an angular shape
 Antonyms:

circular, round
having a circular shape

appleshaped
having the general shape of an apple

ballshaped, global, globose, globular, orbicular, spheric, spherical
having the shape of a sphere or ball

barrelshaped
having the general shape of a barrel

bulbshaped, bulblike, bulbous
shaped like a bulb

capitate
being abruptly enlarged and globose at the tip

coccoid
spherical; like a coccus

cumuliform
shaped like a cumulus cloud

discshaped, disclike, discoid, discoidal, diskshaped, disklike
having a flat circular shape

gobletshaped
resembling the shape of a goblet

moonround, moonlike
resembling the moon in shape

nutlike
resembling a nut in shape and size

pancakelike
resembling a pancake in shape

pearshaped
having a round shape tapered at one end

pinwheelshaped
having the round shape of a pinwheel

ringlike
having the shape of a ring

roundish
somewhat round in appearance or form

wheellike
round like a wheel

rounded
curving and somewhat round in shape rather than jagged
 show more antonyms...
2
n 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”
 Types:
 show 4 types...
 hide 4 types...

carpenter's square
a steel square used by carpenters; larger than a try square

try square
a square having a metal ruler set at right angles to another straight piece

Tsquare
a square used by draftsmen to draw parallel lines

set square
a try square with an adjustable sliding head
 Type of:

hand tool
a tool used with workers' hands
3
n the product of two equal terms
“gravity is inversely proportional to the
square of the distance”
 Synonyms:
 second power
 Type of:

number
a concept of quantity involving zero and units
4
adj characterized by honesty and fairness
“a
square deal”
 Synonyms:
 straight

honest, honorable
not disposed to cheat or defraud; not deceptive or fraudulent

lawful
conformable to or allowed by law

aboveboard, straightforward
without concealment or deception; honest

guileless, transparent
free of deceit

straightarrow
conventionally moral and upright
 Antonyms:

corrupt, crooked
not straight; dishonest or immoral or evasive

dishonest, dishonorable
deceptive or fraudulent; disposed to cheat or defraud or deceive

unlawful
contrary to or prohibited by or defiant of law

sneaky, underhand, underhanded
marked by deception
 show more antonyms...
adj without evasion or compromise
“a
square contradiction”
 Synonyms:
 straight, straightforward

direct
straightforward in means or manner or behavior or language or action
5
n a formal and conservative person with oldfashioned views
 Synonyms:
 square toes
 Type of:

conservative, conservativist
a person who is reluctant to accept changes and new ideas
adj rigidly conventional or oldfashioned
 Synonyms:
 straight

conventional
unimaginative and conformist
7
adj providing abundant nourishment
“four
square meals a day”
 Synonyms:
 hearty, satisfying, solid, substantial

wholesome
conducive to or characteristic of physical or moral wellbeing