Meaning of “override” - Learner’s Dictionary

override

verb [ T ] uk us /ˌəʊvəˈraɪd/ (past tense overrode, past participle overridden)
NOT ACCEPT

If someone in authority overrides a decision or order, they officially decide that it is wrong:

I don't have the power to override his decision.
MORE IMPORTANT

to be more important than something else:

His desire for money seems to override anything else.

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