|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
The settling of disputes (especially labor disputes) between two parties by an impartial third party, whose decision the contending parties agree to accept. Arbitration is often used to resolve conflict diplomatically to prevent a more serious confrontation.