Acquaintance

n.
  1. A state of being acquainted, or of having intimate, or more than slight or superficial, knowledge; personal knowledge gained by intercourse short of that of friendship or intimacy; as, I know the man; but have no acquaintance with him.
  2. A person or persons with whom one is acquainted.
  3. To be of acquaintance ,
    to be intimate.
    To take acquaintance of or with ,
    to make the acquaintance of.