Meaning of “only” - Learner’s Dictionary

only

adverb uk us /ˈəʊnli/
NOT MORE

A1 not more than a particular size or amount:

It'll only take a few minutes.
She's only fifteen.
NO ONE/NOTHING ELSE

A2 not anyone or anything else:

The offer is available to UK residents only.
RECENTLY

B1 used to mean that something happened very recently:

She's only just finished writing it.
not only ... (but) also

B2 used to say that one thing is true and another thing is true too, especially a surprising thing:

Not only did he turn up late, he also forgot his books.

(Definition of “only adverb” from the Cambridge Learner’s Dictionary © Cambridge University Press)