Meaning of “supplementary” in the English Dictionary

"supplementary" in British English

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supplementaryadjective

uk /ˌsʌp.lɪˈmen.tər.i/ us /ˌsʌp.ləˈmen.t̬ɚ.i/

(Definition of “supplementary” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"supplementary" in American English

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supplementaryadjective [ not gradable ]

us /ˌsʌp·ləˈment·tə·ri, -ˈmen·tri/ also supplemental, /ˌsʌp·ləˈmen·təl/

added to something else in order to improve it or complete it:

Teachers often create supplementary materials for their classes.
Some workers are eligible for supplemental unemployment benefits.

(Definition of “supplementary” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"supplementary" in Business English

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supplementaryadjective

uk /ˌsʌplɪˈmentəri/ us US also supplemental

that is provided, needed, or asked for in addition to something else:

Also included will be supplementary liability insurance, often up to $1 million, as protection against claims from any third parties.
A supplementary budget may be needed to cover the cost of repairs.
He is quoted as saying he would not contribute to what he called an unfair supplementary business tax.
We will issue a brief supplemental report when these steps are completed.

(Definition of “supplementary” from the Cambridge Business English Dictionary © Cambridge University Press)