Pronunciation: (myOO'chOO-ul),[key] —adj. 1. possessed, experienced, performed, etc., by each of two or more with respect to the other; reciprocal: to have mutual respect. 2. having the same relation each toward the other: to be mutual enemies. 3. of or pertaining to each of two or more; held in common; shared: mutual interests. 4. having or pertaining to a form of corporate organization in which there are no stockholders, and profits, losses, expenses, etc., are shared by members in proportion to the business each transacts with the company: a mutual company.