supplemental

adjective

sup·​ple·​men·​tal ˌsə-plə-ˈmen-tᵊl 

1

: serving to supplement

2

: nonscheduled

a supplemental airline

supplemental noun

Synonyms

• 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

For younger workers, these aren't just supplemental income streams. —Caroline Castrillon, Forbes.com, 2 Sep. 2025

Drivers in the program wouldn’t have to pay supplemental registration fees. —Nick Lichtenberg, Fortune, 29 Aug. 2025

Community input Parks said the Air Force would seek community input on site selection as part of an upcoming supplemental environmental review. —Kapil Kajal, Interesting Engineering, 29 Aug. 2025

Typically, the White House sends Congress a supplemental spending request sketching out its funding asks; that hasn’t happened yet. —Burgess Everett, semafor.com, 27 Aug. 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