Meaning

• A journey through a particular building, estate, country, etc.

  "On our last holiday to Spain we took a tour of the wine-growing regions."

• A guided visit to a particular place, or virtual place.

  "On the company's website, you can take a virtual tour of the headquarters."

• A journey through a given list of places, such as by an entertainer performing concerts.

  "Metallica's tour of Europe"

• A trip taken to another country in which several matches are played.

• A street and road race, frequently multiday.

• A set of competitions which make up a championship.

• A tour of duty.

• A closed trail.

• A going round; a circuit.

• A turn; a revolution.

  "the tours of the heavenly bodies"

Meaning

• To make a journey

  "The Rolling Stones were still touring when they were in their seventies."

• To make a circuit of a place

  "The circuses have been touring Europe for the last few weeks."