assertion assertion /əˈsɝːʃən/

noun

1. () A declaration that is made emphatically (as if no supporting evidence were necessary)  ( asseveration , averment , assertion )
   a declaration that is made emphatically (as if no supporting evidence were necessary)
   
2. () The act of affirming, asserting or stating something  ( affirmation , statement , assertion )
   the act of affirming, asserting or stating something