Meaning of “then” - Learner’s Dictionary

then

adverb uk us /ðen/
TIME

A1 at that time:

Call me tomorrow - I'll have time to speak then.
Tim and I were at school together, but I haven't seen him since then.
NEXT

A1 next, or after something has happened:

She trained as a teacher and then became a lawyer.
Let me finish my drink, then we'll go.
SO

A2 so or because of that:

Have a rest now, then you won't be tired this evening.
"My interview's at 9 o'clock." "You'll be catching an early train, then?"
IN ADDITION

B2 used in order to add something to what you have just said:

I've got two essays to write and then my science project to finish.
now then/right then/okay then

used to introduce a question or a suggestion:

Right then, what do you want to drink?
Now then, shall we make a start?

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