speed

The rate at which someone or something moves or operates; the quickness of a movement or action. Speed can refer to how fast something is traveling or the efficiency of a process.

• The speed of the train was impressive. — 電車の速度は素晴らしかった。
• He completed the task with great speed. — 彼はその作業を非常に迅速に完了しました。

To move or operate more quickly; to accelerate the pace of an action. This often involves increasing the rate at which something is done or occurs.

• They decided to speed up the project to meet the deadline. — 彼らは締切に間に合わせるためにプロジェクトを迅速化することに決めた。
• You need to speed if you want to catch the bus. — バスに間に合いたいなら、急いで行く必要があります。

Describing something that moves or occurs at a fast rate; characterized by quickness or rapidity. It often refers to vehicles, animals, or actions that involve quick movement.

• She drives a speed car that can reach 60 mph in just a few seconds. — 彼女は数秒で時速60マイルに達するスポーツカーを運転しています。
• The speed of light is faster than that of sound. — 光の速度は音よりも速いのです。