quadrature
/ˈkwɒdrətʃə(r)/noun
mass noun
1
- 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。
2
- 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。
3
- 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。
词源
mid 16th cent. (as a mathematical term)： from Latin quadratura 'a square， squaring'， from quadrare （see QUADRATE）.