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

This supplemental study followed earlier environmental and asbestos studies authorized by a previous prospective buyer that, along with a site survey, were purchased by the village at a cost of $105,105. —Jennifer Johnson, Chicago Tribune, 22 May 2026

Sorsby is seeking a hearing for a temporary injunction by June 15, one week before the deadline to file paperwork for the NFL's supplemental draft. —ABC News, 20 May 2026

Because Medicare enrollment, supplemental insurance decisions, and Social Security timing all happen in a narrow window. —Kurt Knutsson, FOXNews.com, 19 May 2026

There is no specific treatment for hantavirus infections and patients usually receive supportive care like supplemental oxygen for respiratory issues and dialysis in the case of kidney failure. —Mary Whitfill Roeloffs, Forbes.com, 18 May 2026

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