| 单词 | quadrature |
| 释义 | quadrature /kwod"reuh cheuhr, -choor'/, n. 1. the act of squaring. 2. Math. a. the act or process of finding a square equal in area to a given surface, esp. a surface bounded by a curve. b. the act or process of finding an area or calculating an integral, esp. by numerical methods. c. a definite integral. 3. Astron. a. the situation of two heavenly bodies when their longitudes differ by 90°. b. either of the two points in the orbit of a body, as the moon, midway between the syzygies. c. (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°. [1545-55; < L quadratura, equiv. to quadrat(us) (ptp. of quadrare; see QUADRATE) + -ura -URE] |
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