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mastery
masthead
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mastiff bat
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master switch
mas·ter switch (plural mas·ter switches)


noun 
Definition:
 
electrical switch: a switch that controls the supply of electricity to a place or to a set of equipment
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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