Definitions: (1) suitable or appropriate; proper or becoming; (2) to be in harmony or accord; belonging <I plan on fitting in at my new school.>

Synonyms: adequate, apposite, apt, competent, conformable, congruous, expedient, seemly

• One cannot, and must not, try to erase the past merely because it does not fit the present. — Golda Meir (1898–1978) 4th Prime Minister of Israel
• I think the best way to deal with fitting in is to be yourself. It sounds hard, but in the end, it’s much easier than pretending to be something you’re not. — Meaghan Jette Martin (1992-) American actress and singer
     Note: If the milieu of the group has a narrowly structured mindset, the oblique uniquenesses of the individual tend to be – at best – ignored or not honored with any favor and – at worse – chiseled off aggressively.