supplemental

adjective

sup·​ple·​men·​tal ˌsə-plə-ˈmen-tᵊl 

1

: serving to supplement

2

: nonscheduled

a supplemental airline

supplemental noun

Synonyms of supplemental

• auxiliary
• additional
• supplementary
• accessory
• peripheral

Examples of supplemental in a Sentence

She receives a supplemental income every month from the government.

the new program will provide supplemental health insurance to thousands of workers

Recent Examples on the Web

With joint support the focus of this supplemental chew, they’re made of turmeric, bovine collagen, and glucosamine HCL. —Victoria Uwumarogie, Essence, 23 Dec. 2025

His dad holds the record as the youngest person to summit Everest without supplemental oxygen. —Cecilia Vega, CBS News, 22 Dec. 2025

Wish Book donations will provide supplemental foods to help sustain the nutritional needs of families impacted by poverty. —Luis Melecio-Zambrano, Mercury News, 21 Dec. 2025

Perhaps because of shortages—or difficulties finding a doctor willing to prescribe leucovorin at all—some parents are turning to supplemental forms of folate. —Tom Bartlett, The Atlantic, 19 Dec. 2025

Word History

Etymology

supplement entry 1 + -al entry 1

First Known Use

1605, in the meaning defined at sense 1

Rhymes for supplemental

• accidental
• compartmental
• continental
• detrimental
• elemental
• fundamental
• governmental
• incidental
• incremental
• instrumental
• interdental
• monumental

Medical Definition

supplemental

adjective

sup·​ple·​men·​tal ˌsəp-lə-ˈment-ᵊl 

: serving to supplement : supplementary

Legal Definition

supplemental

adjective

sup·​ple·​men·​tal ˌsə-plə-ˈment-ᵊl 

: serving to complete or make an addition

supplemental appropriations

specifically : of, relating to, or being a supplemental pleading

supplemental noun