come / go in
1 (not usually used in the passive) (formal) to come or go into sth:
[V] Knock before you enter. * Enter Hamlet (= for example as stage directions in the text of a play). * [VN] Someone entered the room behind me. * Where did the bullet enter the body? * (figurative) A note of defiance entered her voice. * (figurative) It never entered my head (= I never thought) that she would tell him about me.
join institution / start work
2 [VN] [nopassive] to become a member of an institution; to start working in an organization or a profession:
to enter a school / college / university * to enter politics / the legal profession * to enter Parliament (= become an MP) * to enter the Church (= become a priest)
begin activity
3 [VN] to begin or become involved in an activity, a situation, etc:
to enter a relationship / conflict / war * Several new firms have now entered the market. * The investigation has entered a new phase. * The strike is entering its fourth week.
exam / competition
4 ~ (for sth)
