introversion

Noun
  1. The condition of being folded inward or sheathed (synset 114085814)
  2. The folding in of an outer layer so as to form a pocket in the surface (synset 113523144)
    "the invagination of the blastula"
  3. (psychology) an introverted disposition;
    Concern with one's own thoughts and feelings (synset 104629320)

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