authoritative

The definition of authoritative is someone or something having power, influence or the right to control and make decisions.

(adjective)

When a parent speaks to a child in a certain tone of voice so that the child knows he must obey, that is an example of an authoritative voice.
A supervisor who is in charge of setting schedules is an example of a person who is authoritative.

Authoritative is defined as someone who knows a great deal about a certain subject and who is generally considered an expert.

(adjective)

A book written by an expert on certain subject matter is an example of an authoritative book.

See authoritative in Webster's New World College Dictionary

adjective

having or showing authority; official
based on competent authority; reliable because coming from one who is an expert or properly qualified: an authoritative biography
asserting authority; fond of giving orders; dictatorial

Origin: ML auctoritativus

Related Forms:

See authoritative in American Heritage Dictionary 4

adjective

Having or arising from authority; official: an authoritative decree; authoritative sources.
Of acknowledged accuracy or excellence; highly reliable: an authoritative account of the revolution.
Wielding authority; commanding: the captain's authoritative manner.

Related Forms: