Meaning of “insistence” - Learner’s Dictionary

insistence

noun [ U ] uk us /ɪnˈsɪstəns/
DEMAND

a demand that something must be done or that you must have a particular thing:

[ + that ] his insistence that his children should have a good education
Clare's insistence on a vegetarian diet caused arguments with her mother.
SAYING SOMETHING IS TRUE

the act of saying firmly that something is true, especially when other people do not believe you:

[ + that ] Jane was in trouble despite her insistence that she had done nothing wrong.

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