early 15c., from Latin velocitatem (nominative velocitas) "swiftness, speed," from velox (genitive velocis) "swift, speedy, rapid, quick," of uncertain origin, perhaps related to vehere "carry" (see vehicle), or from the same root as vigil.
权威例句
1. Acceleration and velocity are both vectors.
加速度和速度都是矢量。
2. the velocity of light
光速
3. Einstein's theory links energy with mass and velocity of light.
爱因斯坦的理论把能量同质量和光速联系起来.
4. The velocity of light is about 300000 kilometres per second.
光速约为每秒300000公里.
5. A bullet goes from this gun with a velocity of 3000 feet per second.