Register

1. A device that automatically records a quantity or number. Most retails stores use a register to record sale's transactions.
2. A formal or official recording of items, names, or actions. A wedding register will suggest suitable wedding gifts for new wedding couples.
3. An adjustable. grill-like device through which heated or cooled air is released into a room. Each room in our home has one or more registers on the floor.
4. To make an impression; to be recorded in the mind. The warning failed to register.
5. To give outward signs of; express. Her face registered surprise.
6. To enroll officially, or formally, especially in order to vote or attend classes. Each student must register classes they wish to attend.