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1. A communications channel from a switching center or an individual message distribution point to the user terminal. (188) Synonym subscriber line. 2. In telephone systems, a pair of wires from a central office to a subscriber's telephone. (188) Synonyms local loop, user line. 3. Go-and-return conductors of an electric circuit; a closed circuit. 4. A closed path under measurement in a resistance test. 5. A type of antenna, in the form of a circle or rectangle, usually used in direction-finding equipment and in UHF reception. (188) 6 . A sequence of instructions that may be executed iteratively while a certain condition prevails until the loop has been executed once.