
conjunction:
 is the same as; implies and it is implied by; is true and false in the same cases as.

Definition for "if and only if"
 is the same as; implies and it is…
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Sentence for "if and only if"
 1) The sum a geometric sequence…
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Etymologically Related for "if and only if"
 iff
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Urban Dictionary for "if and only if"
 a phrase used by mathematicians and…
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How would you define if and only if?