The declaration, promise, or vow made by a person entering a religious order; (hence) the action of entering such an order; the fact or occasion of…

spec. In the medieval church: Change from the secular to the ‘religious’ life; entry into monastic life. Obsolete. (See Du Cange, conversio.)

The action of admitting a person into a religious order; = profession, n. 1. Now rare.

Investiture with a religious habit. Cf. clothe, v. 1d.

The investiture of a person as a novice in a religious order. Obsolete. rare.

= novitiate, n. 2a; admission to a religious order. rare.

The act or process of becoming a monk, or of becoming or making monastic.