quadrature

noun
quad·​ra·​ture | \ ˈkwä-drə-ˌchu̇r How to pronounce quadrature (audio) , -chər, -ˌtyu̇r, -ˌtu̇r\

Definition of quadrature

1 : a configuration in which two celestial bodies (such as the moon and the sun) have an angular separation of 90 degrees as seen from the earth
2 : the process of finding a square equal in area to a given area

First Known Use of quadrature

1591, in the meaning defined at sense 1

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The first known use of quadrature was in 1591

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