iff

Obsolete spelling of if.

Conjunction alt of, obsolete

  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

Conjunction human sciences, logic

  1. Abbreviation of if and only if.
    • A rectangle is a square iff all four of its sides have the same length.

Related

if