Definition, Meaning & Synonyms

iff

conjunction

ɪf

Definition

The term ‘iff’ is a shorthand used in mathematics and logic to mean ‘if and only if.’ It indicates a biconditional relationship between two statements.

Examples

If it rains, then the picnic is canceled, iff it rains.
You can have dessert iff you finish your vegetables.
A triangle is equilateral iff all its sides are equal.

Meaning

Iff is used to express that two statements are both necessary and sufficient for each other. This means that one statement being true will guarantee the other is true, and vice versa.