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

House Resolution 1 of 2025 reshapes the supplemental nutrition assistance program, known nationally as SNAP and in California as CalFresh, by tightening eligibility, cutting benefits and shifting substantial financial responsibility from Washington to Sacramento and county governments. —JosÉ Luis Villegas, Sacbee.com, 15 Nov. 2025

That makes supplemental discipline for the Miami incident unlikely under present NFL rules and precedent. —Rowan Fisher-Shotton, MSNBC Newsweek, 15 Nov. 2025

The tolerable upper limit (UL) for supplemental magnesium is 350 milligrams (mg) daily for adults. —Cristina Mutchler, Verywell Health, 13 Nov. 2025

However, the study notes that individuals following those diets might require supplemental vitamin D, iodine, and vitamin B12. —Simmone Shah, Time, 12 Nov. 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