verb

1. ENTER, set out on (an enterprise or subject of study)
2. ENTER, make a record of; set down in permanent form
3. ENTER, become a participant; be involved in
4. ENTER, put or introduce into something
5. ENTER, come on stage
6. ENTER, to come or go into
7. ENTER, take on duties or office
8. ENTER, register formally as a participant or member
9. ENTER, be or play a part of or in
10. ENTER, to go or come into (something)
11. ENTER, to begin to be in (an organization, school, etc.)
12. ENTER, to cause (someone) to be in an organization, school, etc.

1. Knock on the door before you enter the room.
2. The medication will quickly enter the blood stream.
3. The river enters the sea near here.