Having the power to influence or control; commanding respect.

प्रभावी

English Usage: The authoritative tone of the teacher made the students pay attention.

Hindi Usage: शिक्षक की प्रभावी आवाज़ ने छात्रों का ध्यान आकर्षित किया।

A person who has a lot of knowledge about a particular subject and can give reliable information.

जानकार

English Usage: She is considered an authoritative on medieval history.

Hindi Usage: उसे मध्यकालीन इतिहास का जानकार माना जाता है।

To declare or confirm with authority.

आधिकारिक रूप से बताना

English Usage: The judge authoritatived the sentence with a firm voice.

Hindi Usage: न्यायाधीश ने एक मजबूत आवाज में सजा को आधिकारिक रूप से बताया।