WordWeb Online

1. Concerning each of two or more persons or things; especially given or done in return
   "mutual respect";
   - reciprocal
    
2. Shared by or having the same connection with two or more parties
   "the mutual interests of management and labour";
   - common

See also: bilateral, correlative, interactional, interactive, reciprocative, reciprocatory, shared, trilateral

Antonym: nonreciprocal

Encyclopedia: Mutual, OK