assert
Concise Oxford English Dictionary © 2008 Oxford University Press:
assert/əˈsɜːt/
▶verb
- 1 state a fact or belief confidently and forcefully.
- 2 cause others to recognize (one's authority or a right) by confident and forceful behaviour.
■ (assert oneself) behave or speak confidently and forcefully.
– derivatives
asserter (also assertor) noun.
asserter (also assertor) noun.
– origin C17 (earlier (ME) as assertion): from L. asserere ‘claim, affirm’, from ad- ‘to’ + serere ‘to join’.
'assert' also found in these Oxford entries:

