familiarity

Noun

• an act of undue intimacy

• a casual manner

• close or warm friendship
  • the absence of fences created a mysterious intimacy in which no one knew privacy
    

• usualness by virtue of being familiar or well known

• personal knowledge or information about someone or something

Related words

• Synonyms: 
  impropriety , indecorum , liberty , casualness , intimacy , closeness , acquaintance , conversance , conversancy
• Antonyms: 
  unfamiliarity , strangeness