fast

fast/ fæst, fɑst /

adjective, fast·er, fast·est.
moving or able to move, operate, function, or take effect quickly; quick; swift; rapid:
a fast horse; a fast pain reliever; a fast thinker.
done in comparatively little time; taking a comparatively short time:
a fast race; fast work.
(of time)
indicating a time in advance of the correct time, as of a clock.
noting or according to daylight-saving time.

adverb, fast·er, fast·est.
quickly, swiftly, or rapidly.
in quick succession:
Events followed fast upon one another to the crisis.

noun
a fastening for a door, window, or the like.

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