Meaning of fast in English

Adjective

1. moving or acting quickly

His legs are fast. ― He is a fast runner. ― He runs fast.

2. firmly fixed or attached

Adverb

1. quickly

There are many ways to lose a lot of weight fast.

2. firmly

3. deeply

She is fast asleep.

fast²

Noun

1. the practice or period of fasting

Verb

1. eat a little or no food for a period of time

He fasted[abstained from food] for five days.