Definition of IFF

iff

Conj

  • Abbreviation of if and only if.
  • Obsolete spelling of if.

Conjunction

  • Meaning 'if and only if'; a necessary and sufficient condition.

Examples

  • A rectangle is a square iff all four of its sides have the same length.
  • Playing ’IFF’ earned me quick points, a logical choice in a tight game.

Scrabble Score: 9

iff: valid Scrabble (US) TWL Word
iff: valid Scrabble Word in Merriam-Webster MW Dictionary
iff: valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 9

iff: valid Words With Friends Word