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Topic: MEASUREMENT

black box

 noun
     
black box [countable] informal
TTATM a piece of equipment on an aircraft that records what happens on a flight and can be used to discover the cause of accidents [= flight recorder]
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balance box calculator cc cl clock cm cu cup degree density depth dimension factor foot ft g GB gm grid high inch instrument kg km l league length max maximum mean measure(v) measure(n) measurement medium meter(n) meter(v) -meter mg MHz mile minute ml oz part plus point read reading record reset rev rule scale sq. ton unit volume watch weight width zero

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