Real Dictionary

tour
countable noun: A tour is an organized trip that people such as musicians, politicians, or theatre companies go on to several different places, stopping to meet people or perform.

tour in American English
a turn or shift of work; esp., a period of duty or military service at a single place
to go on a tour
to take a tour through
intransitive verb: to travel from place to place
noun: a traveling around from place to place
transitive verb: to travel through (a place)

tour in British English
noun: an extended journey, usually taken for pleasure, visiting places of interest along the route
verb: to make a tour of (a place)

tour in the Oil and Gas Industry
noun: A tour is a shift of a drilling crew.