open

To move something to the side to allow entrance.

Example: I will open the door for our guests.

To prepare for business.

Example: She opened the store.

Having a hole or opening, not closed.

Example: The door was open.

Available for business.

Example: The shop is open.

Available for the public to see and change (of code).

Example: This software has open code because it was released under an open-source license.