Usually means: Equivalence conditional on both sides.
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We found 4 dictionaries that define the word If and only if:

General (3 matching dictionaries)
  1. if and only if: Oxford Learner's Dictionaries
  2. if and only if: Wiktionary
  3. If and only if: Wikipedia, the Free Encyclopedia

Slang (1 matching dictionary)
  1. if and only if: Urban Dictionary

Definitions from Wikipedia (If and only if)

noun:  In logic and related fields such as mathematics and philosophy, "if and only if" (often shortened as "iff") is paraphrased by the biconditional, a logical connective between statements.


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