authoritative

Meanings

1. 1
   adj

   sanctioned by established authority

   an authoritative communique

2. 2
   adj

   Arising or originating from a figure of authority.

   The authoritative rules in this school come not from the headmaster but from the aged matron.

3. 3
   adj

   Highly accurate or definitive; treated or worthy of treatment as a scholarly authority.

   This book is the world's most authoritative guide to insect breeding habits.

4. 4
   adj

   Having a commanding style.

   He instructed us in that booming, authoritative voice of his.

5. 5
   adj

   having authority or ascendancy or influence

6. 6
   adj

   of recognized authority or excellence

Etymology

From authorit(y) + -ative.