A person or persons with whom one is acquainted.
A state of being acquainted with a person; originally indicating friendship, intimacy, but now suggesting a slight knowledge less deep than that of friendship; acquaintanceship.
Personal knowledge (with a specific subject etc.).
Such people collectively; one's circle of acquaintances (with plural concord).
A person who is associated with a defined Internet entity.
The single person who represents an organization, for a specific task.
A specific intersection; a contact point.