autoritet

1. authority
   Učitelj je izgubio autoritet kod učenika. — The teacher has lost his authority over the pupils.
   Roditelji moraju imati autoritet. — Parents need to have authority.
2. (of a person) authority; expert
   Profesor Jović je svetski autoritet u toj oblasti. — Professor Jović is a world authority in that field.

For an expert, the usual constructions are autoritet u oblasti or autoritet za + acc.