The verb enter has 9 senses (first 7 from tagged texts)
1. (89) enter, come in, get into, get in, go into, go in, move into -- (to come or go into; "the boat entered an area of shallow marshes")
2. (24) enter, participate -- (become a participant; be involved in; "enter a race"; "enter an agreement"; "enter a drug treatment program"; "enter negotiations")
3. (17) enroll, inscribe, enter, enrol, recruit -- (register formally as a participant or member; "The party recruited many new members")
4. (8) figure, enter -- (be or play a part of or in; "Elections figure prominently in every government program"; "How do the elections figure in the current pattern of internal politics?")
5. (7) record, enter, put down -- (make a record of; set down in permanent form)
6. (2) enter -- (come on stage)
7. (1) insert, infix, enter, introduce -- (put or introduce into something; "insert a picture into the text")
8. accede, enter -- (take on duties or office; "accede to the throne")
9. embark, enter -- (set out on (an enterprise or subject of study); "she embarked upon a new career")