1. (n.) Any label that identifies the location of data in either static or dynamic memory, such as a frame number on coded videotape. 2. (n.) An unsigned integer used to select one fundamental element of storage, usually a word from a computer’s main memory or another storage device. The central processing unit (CPU) outputs addresses on its address bus, which may be connected to an address decoder, a cache controller, a memory management unit, or some other device. 3. (n.) In computer networking, an email address, Internet address, or media access control (MAC) address on a network. 4. (n.) In telecommunications, a telephone number. 5. (v.) To send a message to a particular location.