supplement

noun

• 1a thing added to something else in order to complete or enhance 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 colour magazine, added to a newspaper or periodical: our special supplement is packed with ideas for healthy hair
• a sum of money paid to increase a person’s income: an earnings-related supplement was paid during the first six months of unemployment
• an additional charge payable for an extra service or facility:the single room supplement is £2 per night

• 2 Geometry the amount by which an angle is less than 180°.

verb

• add an extra element or amount to:she took the job to supplement her husband’s income