conjunction
- if and only if; used in logic and mathematics to indicate that two statements are equivalent
Usage: mathematical; logical
Examples
- A triangle is equilateral iff all three sides are equal.
- The function is continuous iff it has no breaks or jumps.
- A number is even iff it is divisible by 2.
- The statement is true iff both conditions are met.
- In logic, P iff Q means P implies Q and Q implies P.
- A quadrilateral is a square iff it has four equal sides and four right angles.