commutator

[n] - switch for reversing the direction of an electric current
Found on http://www.webdictionary.co.uk/definition.php?query=commutator

commutator

noun switch for reversing the direction of an electric current
Found on http://wordnetweb.princeton.edu/perl/webwn?s=commutator

Commutator

mechanical device in a brushed DC motor that passes current from the brushes to the windings.
Found on http://www.empiremagnetics.com/glossary/glossary.htm#A

Commutator

The part of a DC motor armature that causes the electrical current to be switched to various armature windings. Properly sequenced switching creates the motor torque. The commutator also provides the means to transmit the electrical current to the moving armature through the brushes that ride on the commutator.
Found on http://www.electricmotorwarehouse.com/Glossary.htm

Commutator

The rotating part of a DC generator.
Found on http://www.otherpower.com/glossary.html

Commutator

A cylindrical device mounted on the armature shaft and consisting of a number of wedge-shaped copper
Found on http://www.superglossary.com/Glossary/Technology/Motors/
No exact match found