Meaning & Definition of Informal in English

1. Not formal

• "Conservative people unaccustomed to informal dress"

• "An informal free-and-easy manner"

• "An informal gathering of friends"

2. Not officially recognized or controlled

• "An informal agreement"

• "A loose organization of the local farmers"

3. Used of spoken and written language

4. Having or fostering a warm or friendly and informal atmosphere

• "Had a cozy chat"

• "A relaxed informal manner"

• "An intimate cocktail lounge"

• "The small room was cozy and intimate"