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

Today there’s a rich universe of supplemental Pynchon material ranging from prose only an English PhD could unpack, to sharp analysis that makes the experience of reading Pynchon communal and fun. —Literary Hub, 7 Oct. 2025

Fairlead Strategies undertakes no obligation to maintain or update this material based on subsequent information and events or to provide you with any additional or supplemental information or any update to or correction of the information contained herein. —Katie Stockton, CNBC, 6 Oct. 2025

The participants received two breast cancer screenings each year that included the combination of a supplemental MBI test and a 3D mammogram, also called digital breast tomosynthesis (DBT). —Hannah Millington, MSNBC Newsweek, 3 Oct. 2025

Employees laid off may qualify for supplemental unemployment benefits, regardless of union affiliation. —Kansas City Star, 2 Oct. 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