'Readers first!': a new definition of Search Engine Optimization

Bill Belew at Search Engine Journal says:

I ask “What is search engine optimization?” often when I give talks. Most of the time I get stares in response. Some people try but give up soon enough. What would you answer? Tell me in the comments BEFORE reading on. 

I have a new definition for the term: 

Search Engine Optimization is creating good content on a web site in the form of pages and posts that real people want to read, which satisfies the query AND can be found by a search engine. In that order. Readers first!