mutual >> ˈmjuːtʃʊəl
Definition: [adjective] (of a feeling or action) experienced or done by each of two or more parties towards the other or others.
Example: a partnership based on mutual respect and understanding
Definition: [adjective] held in common by two or more parties.
Example: we were introduced by a mutual friend
Definition: [noun] a mutual building society or insurance company.
Example: life insurance firms are mutuals, owned by their policyholders