coactive I. co·ac·tive\(ˈ)kō|aktiv\adjective Etymology:coact (I) + -ive : serving to compel or constrain : of compulsory nature : restrictive < any coactive power of the civil kind — William Warburton > • co·ac·tive·lyadverb • co·ac·tiv·i·ty\ˌkōakˈtivəd.ē\noun-es II. co·active\(ˈ)kō+\adjective Etymology:co- + active : acting in concurrence or together • co·actively\“+\adverb • co·activity\“+\noun