Definition of "introvert" []

• To turn or direct inward. (verb-transitive)
• Psychology To concentrate (one's interests) upon oneself. (verb-transitive)
• Medicine To turn (a tubular organ or part) inward upon itself. (verb-transitive)
• Psychology An introverted person. (noun)
• Medicine An anatomical structure that is capable of being introverted. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A story in the online Atlantic Monthly on how to survive in the world as an introvert is one of the most-blogged stories of the day, according to Blogdex."
• "I’m not sure introvert is the right word for shyness."
• "But not somebody who goes from being an introvert to an extravert (because a true introvert is exhausted by being around people, and extraverts are energized by other people, and that just doesn’t change in real life) or from being a couch potato to loving exercise and training (because that’s an incredibly difficult change in real life too)."