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English definition of “comet”

comet

noun [C] uk   /ˈkɒm.ɪt/ us    /ˈkɑː.mɪt/
an object that moves around the sun, usually at a great distance from it, that is seen on rare occasions from Earth as a bright line in the sky
(Definition of comet from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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