A transference or shift as of opinion or attention. They do not have an onoff position like single pole switches.

Three Way Lights How Three Way Switches Work Howstuffworks
4 way switch definition. In the first position the contacts are connected straight through so that the switch has no effect. 4 way switch configurations are used to control lights with three or more switches. The switch can be used to control the electricity supplying lights from three locations. Each set of terminals is one of the toggle positions. Note that in the above animation the wires are color coded to indicate their voltage state. It has 4 terminals or poles and consists of two 3 way switches that are modified.
The center switch is 4 way switch while the outer two switches are 3 way. There are four terminals that provide two sets of toggle positions on a four way switch. That page and its links also discuss proper wire colors and several wiring alternatives. A 4 way switch has two positions. Definition of four way switch. A device used to break or open.
A 4 way switch is a double pole double throw dpdt switch. An exchange or a swap especially one done secretly. A 3 way switch is used on each end with one or more 4 way switches in between the two 3 way switches. All four terminals are always brass in color. In position two the switch cross connects the contacts on the left with the contacts on the right in an x connection. Four way switch synonyms four way switch pronunciation four way switch translation english dictionary definition of four way switch.
Four way switches are used in combination with three way switches. Four way switches are used to control lighting from three or more locations. An electric switch used in house wiring so that a light may be turned on or off at three or more places. For a discussion of how to wire such circuits see 3 way and 4 way light switches.