co-respondent
noun/ˌkəʊ rɪˈspɒndənt/
/ˌkəʊ rɪˈspɑːndənt/
(law)- a person who is said to have committed adultery with the husband or wife of somebody who is trying to get divorced
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co-respondent
Definition of co-respondent noun from the Oxford Advanced Learner's Dictionary