Dictionary:

introversion

  (ĭn'trə-vûr'zhən, -shən)

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1. The act or process of introverting or the condition of being introverted.
2. Psychology. The direction of or tendency to direct one's thoughts and feelings toward oneself.

A personality trait characterized by a tendency to be preoccupied with oneself; to be shy, cautious, and to be inwardly reflective more than overtly expressive. Compare extroversion.

The turning outside in, more or lees completely, of an organ.