only if

Definitions

Used to introduce a condition that must be met for a specific outcome to occur.

Indicating that a stated condition is necessary, though not necessarily sufficient, for a result.

Examples

You can enter the laboratory only if you are wearing protective goggles.

I will agree to the terms only if you provide a written guarantee.

Synonyms

provided that on condition that contingent upon given that subject to

Antonyms

regardless of in any case no matter what unconditionally without restriction