noun

• One who or that which divides or separates.
• A physical object for dividing up a space.
• A piece of card placed in a ring binder to separate groups of documents.
• An electronic device for separating a signal, frequency, etc., into two or more parts.
• A device resembling a drawing compass and used to transfer measurements of length.
• The median (US) or central reservation (UK) of a highway or other road where traffic in opposite directions are kept separated.