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

As applied here, the limitations of the supplemental proceeding did not allow the three LLCs to object to the alter ego determination as to the Evelyn Trust and the Lindy Trust. — Jay Adkisson, Forbes.com, 7 July 2026

Over time, a more extensive root system improves a plant’s ability to tolerate hot, dry conditions and access water stored deeper in the soil, reducing the need for frequent supplemental irrigation. — Anthony Reardon, Kansas City Star, 7 July 2026

The city had to plug a roughly $70 million budget shortfall with two supplemental budgets for the last fiscal year that ended June 30. — Gayla Cawley, Boston Herald, 7 July 2026

Provide supplemental irrigation as needed during the first year after planting to develop a robust root system. — Kim Toscano, Southern Living, 3 July 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