/ kənˈfedərət; NAmE / noun , adjective
■ noun
a person who helps sb, especially to do sth illegal or secret
SYN accomplice
■ adjective
belonging to a confederacy
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WORD ORIGIN
late Middle English : from late (ecclesiastical) Latin confoederatus , from con- together + foederatus , based on foedus , foeder- league, covenant.