A startup is a company working to solve a problem where the solution is not obvious and success is not guaranteed,” says Neil Blumenthal, cofounder and co-CEO of Warby Parker.
A startup is an entrepreneurial venture which is typically a newly emerged, fast-growing business that aims to meet a marketplace need by developing or offering an innovative product, process or service.
A startup is a company that is in the first stage of its operations. These companies are often initially bankrolled by their entrepreneurial founders as they attempt to capitalize on developing a product or service for which they believe there is a demand. http://www.investopedia.com/terms/s/startup.asp