Meaning of “adversarial” in the English Dictionary

"adversarial" in British English

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uk /ˌæd.vəˈseə.ri.əl/ us /ˌæd.vɚˈser.i.əl/ formal

involving people opposing or disagreeing with each other:

In the old days of two-party adversarial politics, voting was easy.

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

"adversarial" in American English

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us /ˌæd·vərˈseər·i·əl/

involving opposition or disagreement:

Lawyers enjoy being adversarial.

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

"adversarial" in Business English

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uk /ˌædvəˈseəriəl/ us

an adversarial activity, process, etc. involves arguments or disagreements between two or more people or organizations:

The culture of litigation which is so prevalent means we are living in a much more adversarial environment nowadays.
It is hoped that recent changes to the law will minimize the sometimes adversarial nature of management-labor relations.

LAW relating to a legal process in which lawyers present facts for and against someone who is accused of a crime:

an adversarial system/process

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