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

Perhaps Congress could prohibit supplemental taxes on non-primary residences purchased by out-of-state residents, after finding that those taxes substantially burden interstate residential real estate investment. — Andrew Leahey, Forbes.com, 18 Aug. 2026

In May, the company provided supplemental materials related to operational guidelines for unaccompanied minors and service disruptions. — Chase Hunter, Mercury News, 17 Aug. 2026

Any personal information supplied by an Entrant to the Sponsor will be subject to NPR's Privacy Policy and the supplemental terms of these Official Rules. — August 16, NPR, 16 Aug. 2026

For two weeks last summer, Jack Strand earned supplemental income through a side job as a painter. — Daniel Flick, AJC.com, 14 Aug. 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