If

Conjunction

  • Although; used to introduce a concession.

    "He was a great friend, if a little stingy at the bar."

  • (usually hyperbolic) Even if; even in the circumstances that.
  • Supposing that; used with past subjunctive indicating that the condition is not fulfilled.

    "I'd prefer it if you took your shoes off."

  • Whether; used to introduce a noun clause as the object of certain verbs.

    "I don't know if I want to go or not."

  • Supposing that, assuming that, in the circumstances that; used to introduce a condition or choice.

    "If it rains, I will get wet."

  • (computing) In the event that a statement is true (a programming statement that acts in a similar manner).

    "If A, then B, else C."

Noun

  • (informal) An uncertainty, possibility, condition, doubt etc.

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