fa·mil·iar·i·ty 
/fəˌmɪliˈerəti/ noun
/fəˌmɪliˈerəti/ noun [noncount] 1 : the state of being familiar with something : the state of having knowledge about something — usually + with ▪ His familiarity with local issues helped him during the campaign. ▪ The job requires familiarity with current software. ◊The expression familiarity breeds contempt means that knowing a lot about someone or something can cause you to like that person or thing less. 2 : a friendly and informal way of acting or talking
▪ He spoke to everyone with the easy/relaxed familiarity of an old friend.
▪ He spoke to everyone with the easy/relaxed familiarity of an old friend.
