assertion
UK: əˈsɜːʃən | US: əˈsɜːrʃən
n. a confident and forceful statement of fact or belief
n. the act of asserting something
The word "assertion" derives from the Latin assertio, meaning "a declaration." It combines the prefix ad- (toward) and serere (to join or bind), evolving through Old French asserer (to affirm) into English "assert." The suffix -ion nominalizes the verb, turning the action of asserting into a concrete noun. The core idea is of binding oneself to a statement with confidence.
Her assertion that the project would succeed proved correct.
He made an assertion without providing any evidence.
The lawyer’s assertion was challenged during cross-examination.
Scientific assertions must be backed by data.
She repeated her assertion with unwavering confidence.