Synonyms of assertion in English:

assertion


See definition of assertion

noun

1‘I questioned his assertion that little risk is involved’

SYNONYMS
declaration, contention, statement, claim, submission, postulation, averment, opinion, proclamation, announcement, pronouncement, assurance, attestation, affirmation, protestation, profession, swearing, insistence, avowal
rare maintenance, asseveration

2‘the demonstration was a principled assertion of the right to march’

SYNONYMS
defence, upholding
insistence on