A symbol, sound, or image that represents an idea or concept in language or communication. In linguistics, the word 'tree' is a signifier for the concept of a tree.
An object or element that indicates or signifies something else. The red light is a signifier that the driver must stop the vehicle.
A person who signifies; someone who communicates meaning or intent by signs or other means. As the signifier of the tribe's will, the elder raised the staff to begin the ceremony.