Etymology
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introversion (n.)

1650s, "action of turning inward" (of thought or contemplation), from Modern Latin introversionem, noun of action from past participle stem of *introvertere (see introvert (v.)). Psychological meaning "tendency to withdraw from the world" is from 1912.

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Definitions of introversion

introversion (n.)
the condition of being folded inward or sheathed;
Synonyms: invagination
introversion (n.)
the folding in of an outer layer so as to form a pocket in the surface;
Synonyms: invagination / intussusception / infolding
introversion (n.)
(psychology) an introverted disposition; concern with one's own thoughts and feelings;
From wordnet.princeton.edu