introversion

名词 introversion:

1. the condition of being folded inward or sheathed
   同义词：invagination
2. the folding in of an outer layer so as to form a pocket in the surface
   同义词：invagination, intussusception, infolding
3. (psychology) an introverted disposition; concern with one's own thoughts and feelings

in.tro.ver.sion

n.（名词）
The act or process of introverting or the condition of being introverted.
内向：使内向的行为或过程或者内向时的状态
Psychology The direction of or tendency to direct one`s thoughts and feelings toward oneself.
【心理学】 内向性：将思想及感情引向自己内心的方面或倾向

【引伸】
in.trover.sive