Definitions for board of trade unit
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Princeton's WordNet
kilowatt hour, kW-hr, Board of Trade unit, B.T.U.(noun)
a unit of energy equal to the work done by a power of 1000 watts operating for one hour
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"board of trade unit." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/board of trade unit>.

