Iff

/ɪf/
conjunction

Abbreviation for 'if and only if', used when both parts of the statement must be true or false together.

In mathematics, you could say 'A equals B iff B equals A'.
Visual representation of "iff" - abbreviation for 'if and only if', used when both parts of the statement must be true or false together

Often appears as...

  • iff condition
  • iff statement

Usage tips

Formal

Technical, Academic

conjunction

Abbreviation for 'if and only if', used when both parts of the statement must be true or false together.

In mathematics, you could say 'A equals B iff B equals A'.
Visual representation of "iff" - abbreviation for 'if and only if', used when both parts of the statement must be true or false together

Often appears as...

  • iff condition
  • iff statement

Usage tips

Formal

Technical, Academic

Definition 1 of 1
Visual representation of "iff"
LampPro Tip 1/3

Mathematical Precision

Used for precise conditions in math and logic, where 'if' alone is insufficient.

Illustration for Mathematical Precision
A square is a rectangle iff all angles are 90 degrees.
LampPro Tip 2/3

Not Common Speech

Rare in everyday language; primarily found in technical or academic contexts.

Illustration for Not Common Speech
He's not using 'iff' because it's a casual conversation, not a math class.
LampPro Tip 3/3

Double F Not Mistake

'iff' isn't a typo for 'if'; the double 'f' is intentional to mean a stronger condition.

Illustration for Double F Not Mistake
I'll agree iff you provide concrete evidence.
LampPro Tip 1/3

Mathematical Precision

Used for precise conditions in math and logic, where 'if' alone is insufficient.

Illustration for Mathematical Precision
A square is a rectangle iff all angles are 90 degrees.
LampPro Tip 2/3

Not Common Speech

Rare in everyday language; primarily found in technical or academic contexts.

Illustration for Not Common Speech
He's not using 'iff' because it's a casual conversation, not a math class.
LampPro Tip 3/3

Double F Not Mistake

'iff' isn't a typo for 'if'; the double 'f' is intentional to mean a stronger condition.

Illustration for Double F Not Mistake
I'll agree iff you provide concrete evidence.
LampPro Tip 1/3

Mathematical Precision

Used for precise conditions in math and logic, where 'if' alone is insufficient.

Illustration for Mathematical Precision
A square is a rectangle iff all angles are 90 degrees.
LampPro Tip 2/3

Not Common Speech

Rare in everyday language; primarily found in technical or academic contexts.

Illustration for Not Common Speech
He's not using 'iff' because it's a casual conversation, not a math class.
LampPro Tip 3/3

Double F Not Mistake

'iff' isn't a typo for 'if'; the double 'f' is intentional to mean a stronger condition.

Illustration for Double F Not Mistake
I'll agree iff you provide concrete evidence.
Visual representation of the word "Iff"

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