| 单词 | period |
| 释义 | Word Frequency period(ˈpɪərɪəd) noun 1. a portion of time of indefinable length he spent a period away from home 2. a. a portion of time specified in some way the Arthurian period Picasso's blue period b. (as modifier) period costume 3. a nontechnical name for an occurrence of menstruation 4. geology a unit of geological time during which a system of rocks is formed the Jurassic period 5. a division of time, esp of the academic day 6. physics, mathematics a. the time taken to complete one cycle of a regularly recurring phenomenon; the reciprocal of frequency Symbol: Tb. an interval in which the values of a periodic function follow a certain pattern that is duplicated over successive intervals sin x = sin (x + 2π), where 2π is the period 7. astronomy a. the time required by a body to make one complete rotation on its axis b. the time interval between two successive maxima or minima of light variation of a variable star 8. chemistry one of the horizontal rows of elements in the periodic table. Each period starts with an alkali metal and ends with a rare gas Compare group (sense 11)9. Also called: full stop the punctuation mark (.) used at the end of a sentence that is not a question or exclamation, after abbreviations, etc 10. a complete sentence, esp a complex one with several clauses 11. Also called: sentence music a passage or division of a piece of music, usually consisting of two or more contrasting or complementary musical phrases and ending on a cadence 12. (in classical prosody) a unit consisting of two or more cola 13. rare a completion or end Word origin C14 peryod, from Latin periodus, from Greek periodos circuit, from peri- + hodos way |
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