'Informality' definitions:

Definition of 'informality'

From: WordNet
noun
A manner that does not take forms and ceremonies seriously [ant: formality, formalness]
noun
Freedom from constraint or embarrassment; "I am never at ease with strangers" [syn: ease, informality]

Definition of 'Informality'

From: GCIDE
  • Informality \In`for*mal"i*ty\, n.; pl. Informalities.
  • 1. The state of being informal; lack of regular, prescribed, or customary form; as, the informality of legal proceedings. [1913 Webster]
  • 2. 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. [1913 Webster]