Travel is to go from one place to another, as on a trip; journey; The movement through space (whether by land, SEA or air) as a metaphor for change (D. Boorstein)
Other definition:
Travel is the leisure and other travel including travel for business, medical care, education, etc. All tourism is travel, but not all travel is tourism.
The Travel-Glossary: Everything about Travelling, Sightseeing and the World.