Pronunciation: (tûrn'u-bout"),[key] —n. 1. the act of turning in a different or opposite direction.
2. a change of opinion, loyalty, etc.
3. a reciprocal action; act of doing to someone exactly as that person has done to oneself or another: Turnabout is fair play. 4. a person who changes things; a radical.
5. Chiefly Brit.merry-go-round.