(cycling, by ellipsis) The Tour de France.

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

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

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

(sports, chiefly cricket and rugby) A trip taken to another country in which several matches are played.

(sports, cycling) A street and road race, frequently multiday.

(sports) A set of competitions which make up a championship.

(military) A tour of duty.

(graph theory) A closed trail.

(snooker) A circuit of snooker tournaments

(intransitive) To make a journey

(transitive) To make a circuit of a place