Definition of supplement noun from the Oxford Advanced American Dictionary



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  1. 1a thing that is added to something else to improve or complete it vitamin/dietary supplements (= vitamin S and other foods eaten in addition to what you usually eat) supplement to something Industrial sponsorship is a supplement to government funding.
  2. 2 an extra separate section, often in the form of a magazine, that is sold with a newspaper the Sunday literary supplement
  3. 3 supplement (to something) a book or a section at the end of a book that gives extra information or deals with a special subject the supplement to the Oxford English Dictionary a supplement to the main report
See the Oxford Advanced Learner's Dictionary entry: supplement