Real Dictionary

override
countable noun: An override is an attempt to cancel someone's decisions by using your authority over them or by gaining more votes than them in an election or contest.
verb: If one thing in a situation overrides other things, it is more important than them.
verb: If someone in authority overrides a person or their decisions, they cancel their decisions.

override in American English
the act or an instance of overriding
to ride over
noun: a commission on sales or profits, esp. one paid at the executive or managerial level
transitive verb: to prevail or have dominance over; have final authority or say over; overrule

override in British English
noun: a device or system that can override an automatic control
verb: to set aside or disregard with superior authority or power