Synonyms of supplemental

supplemental

adjective

ˌsə-plə-ˈmen-tᵊl 

1

as in auxiliary

available to supply something extra when needed

the new program will provide supplemental health insurance to thousands of workers

Synonyms & Similar Words

• auxiliary
• additional
• supplementary
• accessory
• peripheral
• makeshift
• accessorial
• appurtenant
• complementary
• added
• further
• backup
• supportive
• assistant
• contributory
• assisting
• another
• substitute
• excess
• subordinate
• secondary
• subsidiary
• surplus
• tributary
• superfluous
• nonessential
• helping
• adjuvant
• unessential
• dispensable
• subservient

Antonyms & Near Antonyms

• main
• principal
• chief
• basic
• primary
• fundamental
• necessary
• prime
• essential
• integral
• vital
• required
• imperative
• requisite
• needed
• all-important
• indispensable
• needful

2

as in supplementary

related to each other in such a way that one completes the other

an astronomer who regards science and religion not as antithetical but as supplemental belief systems

Synonyms & Similar Words

• supplementary
• complementary
• reciprocal
• mutual
• collective
• correlative
• combined
• communal
• cooperative
• joint
• symbiotic
• common
• shared
• conjoint
• united

Antonyms & Near Antonyms

• nonreciprocal
• noncomplementary

Example Sentences

Recent Examples of supplemental

Any attempts to offer him food or supplemental feed or anything like that are more likely to cause harm than do good. — Greta Cross, USA Today, 17 July 2026

Contributions hit records, including $272 million in supplemental payments. — Stuart Loren, Chicago Tribune, 17 July 2026

This is the third Bravo show that has recently filmed supplemental material due to off-camera tabloid stories. — Bethy Squires, Vulture, 15 July 2026

This flexibility could allow xAI to expand its computing capacity faster by providing temporary or supplemental electricity while permanent infrastructure is developed. — Prabhat Ranjan Mishra, Interesting Engineering, 15 July 2026