What does authoritative mean?
"Authoritative" is an adjective describing information, statements, or people that can be trusted as accurate and definitive because they come from a recognised expert or official source. An authoritative biography, for instance, is regarded as the standard work on its subject; an authoritative answer settles the question beyond dispute. The word also describes a personal manner: someone who speaks in an authoritative tone projects confidence and command, inspiring others to listen and comply. This second use emphasises bearing and presence rather than formal rank. Because the word signals credibility and mastery, it is common in academic, journalistic, and professional writing, where sources are routinely praised as authoritative. It should not be confused with "authoritarian", which describes oppressive, dictatorial control. Derived from Latin roots shared with "author" and "authority", "authoritative" ultimately suggests being the origin of knowledge — the voice worth trusting above all others.
Trusted as accurate or definitive because coming from an expert or official source.
"The journal published the most authoritative study on the subject."
Confident and commanding; likely to be respected and obeyed.
"He gave an authoritative nod and the meeting fell silent."
The word "authoritative" literally contains the Latin auctoritas that gave us "author" — so an authoritative book is, in a sense, its own true author.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of authoritative
The adjective derives from "authority", borrowed from Latin "auctoritas", meaning influence, weight, or the power to command belief, itself rooted in "auctor" — an originator or promoter, the same root that gives us "author". The form entered English via Old French "autorité", and "authoritative" appears in written English from roughly the early 17th century. Its cognates include "author", "authorize", and "authorial", all tracing back to that single Latin stem.
Related word forms
How authoritative is actually used
Generally formal to neutral in register. In its first sense it is strongly positive, signalling expertise and trustworthiness; in its second sense it describes manner rather than official standing. It is sometimes confused with "authoritarian", which carries negative connotations.
Easily confused with authoritative
"Authoritarian" describes a person or regime demanding strict, unquestioning obedience (often with negative connotations), while "authoritative" positively describes someone or something trusted as an expert and reliable source.