Meaning of “set” - Learner’s Dictionary

set

adjective uk us /set/

fixed and never changing:

Most people work for a set number of hours each week.
I have no set routine.
be all set

to be ready:

[ + to do sth ] We were all set to go when the phone rang.
→ See also On your marks. Get set. Go!

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