1900–05; < French; see ton1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tonne (tʌn)
Also called (not in technical use): metric ton a unit of mass equal to 1000 kg or 2204.6 pounds
[from French]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Damage at a chemical plant was also reported, with hundreds of people buried and tonnes of poisonous liquid ammonia released.
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