Magisterial (adjective)

1. Having the authority or weight of a master or teacher; authoritative and commanding.
2. Characterized by a dignified and impressive manner; stately.
3. Showing or expressing a commanding or authoritative knowledge or understanding of a subject.

Origin:

The word magisterial comes from the latin magister, meaning "master" or "teacher," which in turn comes from the root magis, meaning "greater." it was originally used to describe someone with authority or mastery in a particular subject, but has since been extended to describe anything that is authoritative or commanding.

Examples:

1. His magisterial presence commanded the room.
2. He delivered the lecture with magisterial authority.
3. The magisterial manner in which she handled the situation was admirable.
4. She had a magisterial approach to teaching.
5. The magisterial style of the building was grand and impressive.