What is the meaning of Classis?

A class or order; sort; type; kind.

An ecclesiastical body or judicatory in certain churches, such as the Dutch Reformed Church. It is intermediate between the consistory and the synod, and corresponds to the presbytery in the Presbyterian church.

A category in the classification of organisms, ranking below divisio and above ordo.

a supracongregational, regional executive body, intermediate in size or rank between the consistory of an individual congregation and a provincial synod.

any one of the five divisions into which Servius Tullius divided the Roman citizenry

the armed forces

fleet

a group, rank, or class

a class (of students)

Source: wiktionary.org