Meaning of “soon” - Learner’s Dictionary

soon

adverb us uk /suːn/
He first met Panos soon after his arrival in Greece.It may not be in your interests to change jobs so soon.He reassured me that I would be paid soon.The restaurant soon filled up with people.The company soon began to flourish under his expert management.

A2 after a short period of time:

I've got to leave quite soon.
It's too soon to make a decision.
He joined the company soon after leaving college.
as soon as

B1 at the same time or a very short time after:

As soon as I saw her, I knew there was something wrong.
They want it as soon as possible.
sooner or later

B2 used to say that you do not know exactly when something will happen, but you are sure that it will happen:

Sooner or later they'll realize that it's not going to work.
would sooner

would prefer:

I'd sooner spend a bit more money than take chances with safety.
no sooner ... than

used to show that something happens immediately after something else:

No sooner had we got home than the phone rang.

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