Difficulty

• The New Oxford American Dictionary defines "enterprise" as "a project or undertaking, typically one that is difficult or requires effort." Christopher Columbus's mission in search of the "New World" was an enterprise, as was the Lewis and Clark expedition to the American West (especially considering both were funded by government to achieve some economic need).
  
  

Entrepreneurship

• The New Oxford American Dictionary also defines an enterprise as an entrepreneurial economic activity. Thus, any start-up company (and Microsoft, Google, Facebook and eBay were all those at one point) is an enterprise.
  
  

As A Quality

• The authors of "Enterprise: Entrepreneurship and Innovation" describe enterprise as the quality of "not standing still." An enterprising person may be an entrepreneur, an "intrapreneur," who drives growth within his company, someone who is innovative in business or someone who seeks knowledge to become self-reliant.
  
  

Business

• Most typically, the word "enterprise" describes a business or economic entity (whether or not it is entrepreneurial or innovative); hence the use of the terms "enterprise application" to describe software for business, and "Enterprise 2.0" to describe a business that is well connected using Internet technology.