Emoticons are pretty important: Harvard cognitive scientist Steven Pinker says they're an extremely useful linguistic evolution. The Oxford English Dictionary named "crying face" the word of the year. Humans collectively send 6 billion emoticons every day. But they don't teach emoticons in school, and some of them are actually hard to understand — at least for some of us.
What is an Entrepreneur? An entrepreneur is a person who sets up a business or businesses, taking on financial risks in the hope of profit. – Oxford Dictionary Definition
Oxford Art Online contains the full text to the landmark art reference source, The Dictionary of Art. It's highlighted here since it's a great source to use to familiarize yourself with discipline specific terms, dates, and facts.