1. the act of squaring.
  2. Mathematics.
    1. the act or process of finding a square equal in area to a given surface, especially a surface bounded by a curve.
    2. the act or process of finding an area or calculating an integral, especially by numerical methods.
    3. a definite integral.
  3. Astronomy.
    1. the situation of two heavenly bodies when their longitudes differ by 90°.
    2. either of the two points in the orbit of a body, as the moon, midway between the syzygies.
    3. (of the moon) those points or moments at which a half moon is visible.
  4. Electronics. the relation between two signals having the same frequency that differ in phase by 90°.

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