The term FITS IN can be defined by four crossword solutions: ADAPTS (6 letters), BELONGS (7 letters), BLENDS (6 letters), and NESTLES (7 letters). Adapting means to make suitable for a new use or situation, belonging is the state of being connected to something, blending is the process of combining two or more things together, and nestling is the act of settling into a comfortable position. All of these words describe the concept of fitting in, which is the ability to adjust to a new environment or situation.