There are also non-busines startups. That is why the Ries definition is the most complete. In the book he defines not-for-profit organizations as startups becau

There are also non-busines startups. That is why the Ries definition is the most complete. In the book he defines not-for-profit organizations as startups because they face the same challenges, and thus benefit from the Build-Measure-Learn approach. I'm not arguiing that yours is incorrect, I just reason that as defined by Ries is more complete.