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Definition of tonne noun from the Oxford Advanced Learner's Dictionary

tonne

noun
 
/tʌn/
 
/tʌn/
(plural tonnes, tonne)
(also metric ton)
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  1. a unit for measuring weight, equal to 1 000 kilograms
    • a record grain harvest of 236m tonnes
    • a 17-tonne truck
    Some people now use the spelling ton even when they mean a metric ton or tonne. Be aware that in the US a ton is a different measure, equal to 2 000 pounds. compare tonTopics Maths and measurementb2
    Word Originlate 19th cent.: from French; compare with ton.
See tonne in the Oxford Advanced American DictionarySee tonne in the Oxford Learner's Dictionary of Academic English

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