- Quadrilateral means four-sided.
An example of something quadrilateral is a square.

- Quadrilateral is defined as a shape with four sides and four angles.
An example of a quadrilateral is a rectangle.

These are quadrilateral shapes.

## quadrilateral

adjective

four-sided

Origin of quadrilateral

; from Classical Latin*quadrilaterus*(see quadri- and amp; lateral) + -al

noun

- Geom. a plane figure having four sides and four angles
- a four-sided area

*Related Forms:*

- quadrilaterally
adverb

## quadrilateral

noun

A polygon having four sides.

adjective

Having four sides.

**quadrilateral**

## quadrilateral

Adjective

(*not comparable*)

- having four sides.