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1something that completes or enhances something else when added to it:the handout is a supplement to the official manual a substance taken to remedy the deficiencies in a person’s diet:multivitamin supplements a separate section, especially a color magazine, added to a newspaper or periodical. 2 Geometry the amount by which an angle is less than 180°.
verb [with object]
add an extra element or amount to:she took the job to supplement her husband’s income