The word "occupied" generally refers to something that is being used, filled, or taken up by someone or something. It can describe a space that is currently in use, a person who is busy with a task, or a position that is held by someone. For example, if a room is occupied, it means that people are inside it and using that space.
The word "occupied" comes from the Latin word "occupare," meaning "to seize, take possession of." This evolved through Middle English around the 14th century, where it referred to holding or possessing a space or position.