Tourism, as anything else related to human behaviour, is not an exact science. As a result no definition of any tourism related term will cover 100% of what you are trying to define. In other words, there will always be variables that fall outside the definition.
As a direct result of this definition dilemma, I have [...]

Looking for a definition of tourism I ran into this blog post. It lists all commonly excepted definitions of the term tourism. While broad, all definitions stipulate travel away from the home area for a certain time period, not less than 24 hours. That is the minimum. A maximum however is missing in these definitions. [...]