1. the position of a celestial body when it is 90 degrees away from another as viewed from a third body
Usage: astronomy
2. the process of finding a square equal in area to a given figure
Usage: mathematics
3. a phase of the moon when it appears as a half circle
Usage: astronomy

Examples

• The moon reaches quadrature twice during each lunar cycle.
• Ancient mathematicians struggled with the quadrature of the circle.
• Jupiter was in quadrature with the sun last week.
• The first quadrature occurs when the moon is half full.
• Quadrature is an important concept in celestial mechanics.
• The quadrature of a parabola was solved by Archimedes.