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English definition of “supplement”

supplement

noun [C]     /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.Augmenting and supplementing 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.Books and parts of books 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.Books and parts of books
(Definition of supplement noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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