iff

Etymology 1

conj

  1. (mathematics, logic) Short for if and only if.
    A rectangle is a square iff all four of its sides have the same length.

Etymology 2

conj

  1. Obsolete spelling of if.
    For iff the patient be aſhamed to diſcloſe hiſ wounde to the phyſician which knoweth it not , phyſicke can not helpe him. 1565, Thomas Stapleton, A Fortreſſe of the Faith &c., Ihon Laet, the 2. part. 112

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