enter

1. enter (verb) — sense 1

Definition: To go or come into an enclosed or partially enclosed space.

Example: You should knock before you enter, unless you want to see me naked.

2. enter (verb) — sense 2

Definition: To cause to go (into), or to be received (into); to put in; to insert; to cause to be admitted.

Example: to enter a knife into a piece of wood

3. enter (verb) — sense 3

Definition: To go or come into (a state or profession).

Example: My twelve-year-old son will be entering his teens next year.

4. enter (noun) — sense 4

Definition: The action of entering; an instance of entering.