IPA: //məˈdʒɪstrəli//
KK: /mægˈɪstrəli/
In a way that is authoritative or commanding, often used to describe actions or statements that are made with great confidence and authority.
The professor spoke magistrally, leaving no room for doubt about his expertise.
Magistrally → It is formed from "magister" (meaning master or teacher) and the adverbial suffix "-ly" (meaning in the manner of). The word "magistrally" means in the manner of a master or teacher, often implying authority or expertise.
Think of a 'master' ('magister') showing how to do something 'in the manner of' ('-ly') — that's why magistrally means doing something with mastery or authority.