- The state of being informal; want of regular,
prescribed, or customary form; as, the informality of legal
proceedings. - An informal, unconventional, or unofficial act or
proceeding; something which is not in proper or prescribed form or does
not conform to the established rule.
Meaning of 'informality' (Princeton's WordNet)
1 . informality
[ n]
Meaning (1): - freedom from constraint or embarrassment