1. the quality or state of being casual, relaxed, or not following strict rules or conventions
2. lack of ceremony or official protocol

Examples

• The informality of the meeting made everyone feel comfortable.
• She appreciated the informality of her new workplace.
• The restaurant’s informality attracted families with young children.
• His informality put the nervous students at ease.
• The wedding had a charming informality that guests loved.
• The informality of their friendship allowed them to speak openly.