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

Crepe myrtles need about an inch of water per week and supplemental water is especially important during periods of intense drought. — Lauren Landers, The Spruce, 4 Aug. 2026

Plus, the proposal would institute caps on patient out-of-pocket spending and offer supplemental benefits to all, such as dental, vision and hearing. — Joshua P. Cohen, Forbes.com, 4 Aug. 2026

If Springfield does not approve a supplemental appropriation — or if the money does not arrive in time — the layoffs avoided today may return in the middle of the school year. — Angel Gutierrez, Chicago Tribune, 3 Aug. 2026

And even with those investments, Connecticut will reduce its unfunded pension obligations this year by a level that nearly matches prior supplemental debt payments Lamont has made. — Keith M. Phaneuf, Hartford Courant, 3 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