Also found in: Dictionary, Thesaurus, Wikipedia.
three-way switch[′thrē ¦wā ′swich]
An electric switch with three terminals used to control a circuit from two different points.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A switch used in house wiring when a fixture is to be turned on or off from two different locations in the house. A three-way switch must be used at each location.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
An electric switch, used in conjunction with a similar switch, to control lights from two different points, as from two different ends of a hallway.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.