The Wikipedia definition may be accurate. It's important to note that it does not say "undeveloped markets." You added that in your head. "Development and rese

The Wikipedia definition may be accurate. It's important to note that it does not say "undeveloped markets." You added that in your head. "Development and research for markets" -- just markets. That means any market. Startup is a phase, not a type of business. There's no reason not to consider a brand new restaurant a startup. Except possibly that it did its market research before opening its doors, unlike what most people on HN call a "startup."