1. (verb)supplement to add sth extra in order to improve the level or standard of sth Supplement your income by working from home.
2. (noun)supplement sth extra that you add to improve the level or standard of sth vitamin supplements
Definition of 'Supplement'
Webster Dictionary
1. (verb)Supplement that which supplies a deficiency, or meets a want; a store; a supply
2. (verb)Supplement that which fills up, completes, or makes an addition to, something already organized, arranged, or set apart; specifically, a part added to, or issued as a continuation of, a book or paper, to makegood its deficiencies or correct its errors
3. (verb)Supplement the number of degrees which, if added to a specified arc, make it 180¡; the quantity by which an arc or an angle falls short of 180 degrees, or an arc fallsshort of a semicircle.
4. (verb)Supplement to fill up or supply by addition; to add something to