Creative Commons defines commercial use as "primarily intended for commercial advantage or monetary compensation." They have more info about the noncommercial license itself here: http://creativecommons.org/licenses/by-nc/4.0/legalcode
They also have a detailed article about defining 'noncommercial' at this link.
If you want a more specific answer though, I'd ask Creative Commons... We'd love to answer the question 100% here, but we want to make sure to provide you with the most reliable answer possible, and that's going to come from the source. Creative Commons can be reached at their site here if the articles above still leave you curious!