Intermediate (B1)
IPA: /ˈsʌplɪmənt/
KK: /ˈsʌpləmənt/
Definition
Something that is added to something else to provide extra information, correct errors, or enhance it in some way.
Example
The author included a supplement at the end of the book to clarify some points.
Conversation

Have you seen the latest supplement that came with the newspaper?

Yeah, it had some interesting articles about health and fitness.

I think it’s great when they include a supplement like that to provide more information.

Absolutely! It makes reading the paper a lot more enjoyable.
Synonyms & Antonyms
Synonyms
addition
appendix
enhancement
Antonyms
deduction
reduction
decrease
Definition
To add something extra to improve or complete something.
Example
She decided to supplement her income by taking a part-time job.
Tense Forms
Past: supplemented
Past Participle: supplemented
Conversation

Have you thought about how to supplement your diet lately?

Yeah, I've been looking into some options that could help.

I read that protein shakes can really supplement your meals effectively.
Root Explanation
Supplement → It is formed from "sub-" (meaning under) and "plere" (meaning to fill). The word refers to something that fills in or adds to what is already present, often to enhance or complete it.
Memory Tip
Think of adding something 'under' ('sub-') to 'fill' ('plere') what is missing — that's why supplement means to add to or enhance.
Visually Confused Words
unsupplemented
subelement
presupplemental
couplement