quadrature

quadrature
[ˈkwɒdrətʃə]
noun
[mass noun]

(Mathematics)the process of constructing a square with an area equal to that of a circle, or of another figure bounded by a curve
(数)求积分，求面积
(Astronomy)the position of the moon or a planet when it is 90° from the sun as viewed from the earth
(天文)方照；上弦；下弦
(Electronics)a phase difference of 90 degrees between two waves of the same frequency, as in the colour difference signals of a television screen
(电子)转象差，九十度相位差

语源

mid 16th cent. (as a mathematical term): from Latin quadratura 'a square, squaring', from quadrare (see quadrate)

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