• Moving with great speed, or capable of doing so; swift, rapid. [from 14th c.]

    "I am going to buy a fast car."

  • Deep or sound (of sleep); fast asleep (of people). [16th-19th c.]
  • (colloquial) Having an extravagant lifestyle or immoral habits. [from 18th c.]

    "She's fast – she slept with him on their first date.."

  • (of people) Steadfast, with unwavering feeling. (Now only in set phrases like "fast friend".) [from 10th c.]
  • (computing, of a piece of hardware) Able to transfer data in a short period of time.
  • (obsolete) Tenacious; retentive.
  • (of photographic film) More sensitive to light than average. [from 20th c.]
  • Firm against attack; fortified by nature or art; impregnable; strong.
  • Causing unusual rapidity of play or action.

    "a fast racket, or tennis court; a fast track; a fast billiard table"

  • (of dyes or colours) Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent. [from 17th c.]

    "All the washing has come out pink. That red tee-shirt was not fast."

  • Ahead of the correct time or schedule. [from 19th c.]

    "There must be something wrong with the hall clock. It is always fast."

  • (dated) Firmly or securely fixed in place; stable. [from 9th c.]

    "That rope is dangerously loose. Make it fast!"


  • In a firm or secure manner, securely; in such a way as not to be moved [from 10th c.].

    "Hold this rope as fast as you can."

  • Quickly, with great speed; within a short time [from 13th c.].

    "Do it as fast as you can."

  • Immediately following in place or time; close, very near [from 13th c.].

    "The horsemen came fast on our heels."

  • (of sleeping) Deeply or soundly [from 13th c.].

    "He is fast asleep."

  • Ahead of the correct time or schedule.

    "I think my watch is running fast."


  • (archery) Short for "stand fast", a warning not to pass between the arrow and the target


  • The period of time during which one abstains from or eats very little food.
  • (Britain, rail transport) A train that calls at only some stations it passes between its origin and destination, typically just the principal stations
  • The act or practice of abstaining from food or of eating very little food.


  • (intransitive) To abstain from food, or eat very little, especially for religious or medical reasons.

    "Muslims fast during Ramadan."

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