authoritative

Meanings

1. 1
   adj

   Trusted as accurate and reliable because it comes from real knowledge.

   This book is the most authoritative guide to British birds.

2. 2
   adj

   Showing confidence and the ability to be obeyed.

   He gave the orders in a calm, authoritative voice.

3. 3
   adj

   Officially approved or coming from a person in charge.

   We are waiting for an authoritative statement from the government.

From authorit(y) + -ative.

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