enroll

To enter (a name, etc.) in a register, roll or list

All the citizens capable of bearing arms enrolled themselves.

An unwritten law of common right, so engraven in the hearts of our ancestors, and by them so constantly enjoyed and claimed, as that it needed not enrolling.

To enlist (someone) or make (someone) a member of.

They were eager to enroll new recruits.

To enlist oneself (in something) or become a member (of something).

Have you enrolled in classes yet for this term?

To enlist oneself (in something) or become a member (of something).

To enlist oneself (in something) or become a member (of something).