supplemental

adjective

sup·​ple·​men·​tal ˌsə-plə-ˈmen-tᵊl 

1

: serving to supplement

2

: nonscheduled

a supplemental airline

supplemental noun

Synonyms

• accessorial
• accessory
• appurtenant
• auxiliary
• peripheral
• supplementary

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

Derby has suggested modifying certain incentives in a potential contract, including supplemental leave and severance, to ensure the new hire does not make as much. —Mathew Miranda, Sacbee.com, 16 Apr. 2025

In 2022, Montgomery County Public Schools (MCPS) added six LGBTQ-inclusive books to its supplemental curriculum for pre-K through fifth grade, assigning one book for each grade level. —Abby Monteil, Them., 15 Apr. 2025

The filing, a joint supplemental brief in support of final approval, was authored by Rakesh Kilaru, Jeffrey Kessler, Steve Berman and other lead attorneys of the parties. —Daniel Libit, Sportico.com, 15 Apr. 2025

Additional Forms Some filers may need to fill out supplemental tax 1040 forms depending on their tax situation. —Josh Hammer, MSNBC Newsweek, 14 Apr. 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