ˈif-ᵊn(d)-ˈōn-lē-ˌif 
ˈif,
sometimes read with a prolonged
f
: if and only if
two figures are congruent iff one can be placed over the other so that they coincide
—used in logic and mathematics
identification, friend or foe
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“Iff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/iff. Accessed 29 Nov. 2023.
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