Noah Webster's New International Dictionary of the English Language

1. (n.) A tower.

2. (n.) A going round; a circuit; hence, a journey in a circuit; a prolonged circuitous journey; a comprehensive excursion; as, the tour of Europe; the tour of France or England.

3. (n.) A turn; a revolution; as, the tours of the heavenly bodies.

4. (v. t.) anything done successively, or by regular order; a turn; as, a tour of duty.

5. (v. i.) To make a tour; as, to tour through a country.