supplement - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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supplement

noun [C] uk   us   /ˈsʌp.lɪ.mənt/
C2 something that is added to something else in order to improve it or complete it; something extra: The doctor said she should be taking vitamin supplements. The money I get from teaching evening classes provides a supplement to my main income. We paid a supplement (= an extra amount of money) so that we could have a cabin on board the ship. a part of a magazine or newspaper, either produced separately or as part of the magazine or newspaper: The newspaper publishes a sports supplement every Monday. an extra part of a book, either produced separately or included at the end of the book, containing information that was not available when the book was first published: There is a supplement to the dictionary containing new words.

supplement

verb [T] uk   us   /ˈsʌp.lɪ.ment/
C2 to add something to something to make it larger or better: He supplements (= adds to) his income by working in a bar in the evening. Some vegetarians like to supplement their diets with iron.
(Definition of supplement from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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