Definitions:

1. A flat shape with four straight sides. NOUN
   • Squares and rectangles are forms of quadrangles.
2. In architecture, refers to a courtyard or an open space that is completely or partially enclosed by buildings. NOUN
   • The university's main quadrangle is surrounded by the library, the administration building, and the lecture halls.
3. In cartography, refers to a rectangular area of land defined for mapping purposes. NOUN
   • The hikers used a quadrangle map to find their way through the national park.
4. In geometry, is another term for a quadrilateral, which is any four-sided polygon. NOUN
   • In her geometry class, she learned that the area of a quadrangle can be calculated if the lengths of its sides and the measure of its angles are known.

Synonyms:

• courtyard
• enclosure
• four-sided figure
• polygon
• quad
• quadrilateral