1. (

• invagination ,
• introversion

) the condition of being folded inward or sheathed ;

2. (

• invagination ,
• introversion ,
• intussusception ,
• infolding

) the folding in of an outer layer so as to form a pocket in the surface; "the invagination of the blastula" ;

3. (

• introversion

) (psychology) an introverted disposition; concern with one's own thoughts and feelings ;