Someone who is a friend of two or more people, each of whom may not know each other.

(economics) The independent possession, by every individual, of the means of production, in a free market with minimal interest rates.

(information theory) A measure of the entropic (informational) correlation between two random variables.

(law) An incident of multiple assaults and batteries on all sides between involved parties which does not rise to the level of felonious assault or battery, or serious bodily harm, where parties involved are determined to have voluntarily entered into the affray and hence no criminal charges result, in relation to the assaults and batteries.

(biology, sociology) The state of cooperation, as opposed to competition, as a factor in evolution and social development.

plural of mutual society

plural of mutual organization

A mutual organization.

(finance) An organization in which members do not contribute to the capital of the company by direct investment, but derive their right to profits and votes through their customer relationship.

plural of mutual information