enrolled
v.v. to officially join a school, a course, or a group. It means you have put your name on the list to start something new.
v. to officially register as a member of an institution or a participant in a course. Often used in the past participle form to describe a current state of membership.
She enrolled in a local cooking class last week.
After receiving his acceptance letter, he immediately enrolled in the university's engineering program for the fall semester.
The registrar confirmed that over five hundred students had enrolled in the introductory psychology course, necessitating the opening of a second lecture hall to accommodate the demand.
The verb is often used intransitively with the preposition 'in' or 'on', or transitively when an institution registers a person.
I enrolled the courseI enrolled in the courseWhen joining a course or school, the verb requires the preposition 'in' or 'on'.