enter

verb

2.
become a participant; be involved in
Antonym:
drop out
Derived from:
entrant
3.
register formally as a participant or member
4.
be or play a part of or in
5.
make a record of; set down in permanent form
Derived from:
entry
6.
come on stage
7.
take on duties or office
9.
set out on (an enterprise or subject of study)