1. The ability to use either hand with equal skill: Lynn’s sister is an ambidexter, who is able to write with a pen, pencil, or chalk by holding each one with her left or right manual extremities of the arms.
2. General skillfulness; especially, with the hands; very skillful and versatile; using both hands with equal facility: Greg’s wife was obviously an amibidexter because she played the piano with magnificent expertise! 
3. Someone who is equally ready to act on either side of disputes: As the supervisor of his company, Steven was an ambidexter who listened to the arguments presented by two employees and he made a decision as to which one had the most rational viewpoint to follow.