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A scientific way to say speed, but more exact — velocity means how fast something moves AND in what direction. In everyday, non-scientific talk, people sometimes just use it to sound more technical when they mean 'speed,' like 'the car reached top velocity.'
速度、速率（物理用語，含方向性）
組成From Latin "velox," meaning fast or swift.
原始詞典資料5 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。
velocitynoun/vəˈlɒsəti/
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natural-sciencesphysical-sciencesphysicsA vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component.
- A car racing in a circle may retain the same speed while continually changing its velocity.
- Usually, however, confluence is associated with an increase in air velocity and diffluence with a decrease. In the intermediate case, confluence is balanced by an increase in wind velocity and diffluence by a decrease in velocity.
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A rapidity of motion.
- The train was travelling at a slower velocity than usual.
- Over the winter-solid Roads, goes a great seething,— of mounted younger Gentlemen riding together by the dozens upon rented horses, Express Messengers in love with pure Velocity, Disgruntl'd Suitors with Pistols stuff'd in their Spatterdashes, seal'd Waggons not even a western Black-Boy would think of detaining.
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The rate of occurrence.
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economicssciencesThe number of times that an average unit of currency is spent during a specific period of time.
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The value corresponding to how hard a key is struck on a MIDI controller or keyboard.
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。