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Definition of authoritative:

  1. Having an air of authority; positive; dictatorial; peremptory; as, an authoritative tone.
  2. Having, or proceeding from, due authority; entitled to obedience, credit, or acceptance; determinate; commanding.

Synonyms:

unconditional, reigning, crucial, influential, standard, sovereign, haughty, classical, over, imposing, significant, imperial, overbearing, exacting, lordly, governing, reliable, convincing, dogmatic, executive, unequivocal, tyrannical, officious, decide, dependable, domineering, imperative, irresponsible, decisive, of import, determinative, definitive, determinate, coercive, valid, compulsive, arbitrary, sound, mandatory, compulsory, lawful, dominant, unauthorized, important, conclusive, authorized, authentic, classic, final, administrative, legal, illegal, approved, positive, despotic, weighty, absolute, faithful, true, orthodox, sanctioned, trustworthy, peremptory, official, credible, authorised.

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