Enter (verb)

1. To go or come into (a place).
2. To begin to be involved in (a situation or activity).
3. To put or introduce (something) into a particular place or condition.

Origin:

From the old english "entrian" which means "to come in" or "to go in", and the latin "entrare" which means "to go in". it first appeared in english in the 9th century.

Examples:

1. He entered the room quietly.
2. She entered the race at the last minute.
3. They entered the data into the computer.
4. I entered the password to access the website.
5. He is entering the competition for the first time.