- a quadrilateral having both pairs of opposite sides parallel to each other.
- a quadrilateral whose opposite sides are parallel and equal in lengthSee also rhombus, rectangle, trapezium, trapezoid
n.1560s, from Middle French parallélogramme (1550s) and directly from Late Latin parallelogrammum, from Greek parallelogrammon noun use of neuter adjective meaning “bounded by parallel lines,” from parallelos (see parallel) + stem of graphein “to write” (see -graphy).
- A four-sided plane figure with opposite sides parallel. Rhombuses and rectangles are parallelograms.