From Latin supplementum, from supplere ("to provide something").

• (RP) IPA: /ˈsʌp.lɪ.mənt/
• (America) IPA: /ˈsʌp.lə.mənt/
• (Australia) IPA: /ˈsap.lə.mənt/

supplement (plural supplements)

1. Something added, especially to make up for a deficiency.
   • 2023 April 3, Alaina Demopoulos, “Computer-generated inclusivity: fashion turns to ‘diverse’ AI models”, in Katharine Viner, editor, The Guardian‎, London: Guardian News & Media, →ISSN ↗, →OCLC ↗:

     AI models will not completely replace the humans, she said, but will serve as a “supplement” intended to aid in the brand’s representation of various sizes, skin tones and ages.

     (Can we archive this URL?)

2. An extension to a document or publication that adds information, corrects errors or brings up to date.
3. (journalism) An additional section of a newspaper devoted to a specific subject.

   the literary supplement

   • 1907 August, Robert W[illiam] Chambers, chapter IV, in The Younger Set, New York, N.Y.: D. Appleton & Company, →OCLC ↗:

     "Mid-Lent, and the Enemy grins," remarked Selwyn as he started for church with Nina and the children. Austin, knee-deep in a dozen Sunday supplements, refused to stir; poor little Eileen was now convalescent from grippe, but still unsteady on her legs; her maid had taken the grippe, and now moaned all day: "Mon dieu! Mon dieu! Che fais mourir!"

4. (geometry) An angle that, when added to a given angle, makes 180°; a supplementary angle.
5. (nutrition, bodybuilding) A vitamin, herbal extract or chemical compound ingested to meet dietary deficiencies or enhance muscular development.
6. A surcharge, additional cost, especially for food in a restaurant.

   There is a £2 supplement if you choose the steak.

• (something added) addition; See also Thesaurus:adjunct

• complement
• supplementary
• suppletion
• suppletory

• German: Ergänzung
• Portuguese: suplemento, adendo
• Spanish: suplemento

• German: (generally) Nachtrag; (appendix) Anhang; (additional volume of an already completed opus) Supplement, Supplementband
• Portuguese: suplemento, adendo
• Russian: приложе́ние
• Spanish: suplemento

• French: supplément
• German: Beilage
• Portuguese: suplemento
• Russian: приложе́ние

• Portuguese: suplemento
• Russian: дополнительный угол
• Spanish: suplementario

• German: Ergänzungsmittel, Supplement
• Portuguese: suplemento
• Russian: дополне́ние

supplement (supplements, present participle supplementing; simple past and past participle supplemented)

1. To provide or make a supplement to something.

   I supplement my income by working as a model.

• eke out

• German: aufstocken, aufbessern, ergänzen
• Portuguese: suplementar
• Russian: дополня́ть
• Spanish: complementar, suplementar