Reviving an old thread with a similar topic-- what makes a marriott hotel a resort?

As an elite I think of it as not guaranteeing the regular benefits like lounge, breakfast, etc but are there any other criteria? I have stayed at quite a few and some rates did include breakfast, others provided it free as an elite. Other than being a hotel people like to vacation at, what makes a Marriott, JW, or Renaissance a "resort?"