only
Used to say that there is no more than what you say.
Used to indicate that there is no more or nothing else except what is mentioned.
The single one; no others like it.
Being the single one of its kind; without any others of the same type.
Used like 'but' to show a difference or problem with what was just said.
Used to introduce a statement that contrasts with or limits what was just said.
Almost not; by very little.
By a narrow margin; almost not at all.
- Base: only
if and only if
1exact condition requirement in logic/math
Means something is true in one situation and no other; used in math and logic.
- The statement holds if and only if x > 0.
- You can enter if and only if your name is on the list.
not only ... but also ...
1emphasizing two related facts
Used to say that two things are true, with focus on both of them.
- She’s not only smart but also very kind.
- The movie was not only exciting but also funny.
only just
1recently or barely happened
Means something happened very recently or almost did not happen.
- I only just arrived before the meeting started.
- He only just escaped in time.
if only
1expressing an unreal wish
Used to say you wish something were true or had happened.
- If only I had studied harder for the test.
- If only it would stop raining.
if only
2expresses regret or wish
Used to say you wish something was true or had happened.
- If only I had studied harder, I would have passed the test.
- If only it would stop raining!