Meaning of “express” - Learner’s Dictionary

express

adjective uk us /ɪkˈspres/
an express service/train, etc

a service/train, etc that is much faster than usual

an express aim/intention/purpose, etc

a clear and certain aim/intention/purpose, etc:

You came here with the express purpose of causing trouble.

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