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Accelerando is a music word. When a score says accelerando, the playing should get gradually faster — not jump to a new speed, but pick up bit by bit. Players often see the short form accel. Like piano, forte, and ritardando, it is Italian, because Italian marks are the old common language of the page. You can use it as an adverb (play this accelerando) or as a noun (an accelerando into the last chorus). Writers sometimes borrow it for anything that is speeding up; that is a stretch. Its home is music.
漸快（音樂）
組成Borrowed from Italian accelerando, the -ing form of accelerare (to speed up), from Latin accelero: ad- (towards) + celer (fast).
同家族的字
- acceleratesame Latin verb: to get faster
- accelerationthe noun for speeding up, from the same Latin
- acceleratorsame root; in a car, the pedal that makes you go faster
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
accelerandonoun/ɑˌkʃɛl.əˈɹɑn.doʊ/
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entertainmentlifestylemusicA tempo mark directing that a passage is to be played at an increasing speed.
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entertainmentlifestylemusicA passage having this mark.
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Accelerating or exponential advancement or development (of a thing).
- The accelerando of the sciences and of technology, their mathematization have beggared both the reach and the veracity of natural language.
accelerandoadv/ɑˌkʃɛl.əˈɹɑn.doʊ/
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entertainmentlifestylemusicWith a gradual increase in speed.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。