iff

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See also: IFF

English[edit]

Pronunciation[edit]

  • Homophonous to if. Read as “if and only if” to prevent ambiguity.

Conjunction[edit]

iff

  1. (mathematics, logic) If and only if; used to show that the truth values of two statements are the same.
  2. (mathematics, logic) logically equivalent to rephrases:
    A rectangle is a square iff all four of its sides have the same length.
    1. biconditionally
    2. just in case or just in the case that
    3. equal
    4. that is to say
    5. XNOR
  3. Obsolete spelling of if.

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