ALL meanings of authoritatively
au·thor·i·ta·tive
A a - noun authoritatively In an authoritative manner, being worthy of trust. 1
- adjective authoritatively having due authority; having the sanction or weight of authority: an authoritative opinion. 1
- adjective authoritatively substantiated or supported by documentary evidence and accepted by most authorities in a field: an authoritative edition of Shakespeare; an authoritative treatment of a subject. 1
- adjective authoritatively having an air of authority; accustomed to exercising authority; positive; peremptory; dictatorial: said with an authoritative air. 1