Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
finality [faɪˈnælɪtɪ] n оконча́тельность f
to speak with an air of finality говори́ть (impf) то́ном, не допуска́ющим возраже́ния
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.