知己

プログレッシブ和英中辞典(第4版)

ちき【知己】

〔知り合い〕an acquaintance；〔友人〕a friend

知己が広い
have a wide circle of acquaintances／know many people

初対面のときから長年の知己のような親しみを感じた
Even when I first met her I felt as if 「she had been a close friend [I had known her] for years.

出典　小学館「プログレッシブ和英中辞典(第4版)」