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

Vehicle trade-in data suggests that many buyers who are snapping up those fast-selling cheaper vehicles are either first-time buyers or are purchasing supplemental vehicles, Edmunds’ Drury said. — Robert Ferris, CNBC, 30 Oct. 2026

The new complaint is supplemental and contains new details and allegations. — Burgess Everett, semafor.com, 30 Oct. 2026

The university was the only UC system location to offer the supplemental subsidy last year. — Corey Schmidt, Sacbee.com, 29 Oct. 2026

Brokers can be helpful, but make sure to choose one who discusses all your options, including traditional Medicare and supplemental plans. — Brittney Melton, NPR, 29 Oct. 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