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Definition of Iff
1. if and only if [conj]
Lexicographical Neighbors of Iff
idyllically idyllist idyllists idylls idyls Id al-Adha Id al-Fitr id est id reaction ie | Ieoh Ming Pei IEP IF if IFC iff (current term) iffier iffiest iffiness iffinesses | iffy IFN IFN-a IFN-b IFN-g ifosfamide ifs if not Ig Ig |