Mutual

a.
  1. Reciprocally acting or related; reciprocally receiving and giving; reciprocally given and received; reciprocal; interchanged; as, a mutual love, advantage, assistance, aversion, etc.
  2. Possessed, experienced, or done by two or more persons or things at the same time; common; joint; as, mutual happiness; a mutual effort.
    3. Mutual insurance ,
    agreement among a number of persons to insure each other against loss, as by fire, death, or accident.
    Mutual insurance company ,
    one which does a business of insurance on the mutual principle, the policy holders sharing losses and profits pro rata.