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
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Example sentences
The tonne of propellant remaining in its tanks was plenty for the reentry manoeuvres and any contingencies.
It must be remembered that one cubic meter of water weighs one tonne.
Informed medical decisions require a tonne of information.
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