A more thorough explanation:

Definition: Decanus (di-kay-nchwas) is a term that originated from the Greek word "dekanos" which means "a dean". It has three meanings:

1. In Roman law, it refers to an officer commanding ten soldiers.
2. In ecclesiastical and civil law, it refers to a leader of ten people, such as a "decanus monasticus" or "dean of ten monks".
3. It can also refer to the dean of a cathedral.

Example: The decanus of the cathedral was responsible for overseeing the religious activities and managing the affairs of the church.

Explanation: This example illustrates the third meaning of decanus, which is the dean of a cathedral. The decanus is a high-ranking official who has significant responsibilities in the church.