Mutual (adjective)

1. Shared by two or more parties.
2. Reciprocal or mutual.
3. Experienced or felt by each of two or more parties.

Origin:

Middle english: from old french mutuel, from latin mutuus "done in return", from mutare "to change".

Examples:

1. They have a mutual understanding.
2. We have a mutual respect.
3. He and I have a mutual friend.
4. She and I have a mutual interest.
5. They have a mutual goal.