Definition of adversarial adjective from the Oxford Advanced American Dictionary

 

adversarial

 adjective
adjective
NAmE//ˌædvərˈsɛriəl//
 
(formal or technology)
 
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(especially of political or legal systems) involving people who are in opposition and who make attacks on each other the adversarial nature of the two-party system an adversarial system of justice
See the Oxford Advanced Learner's Dictionary entry: adversarial