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.
- Knowledge of a person acquired by a relationship less intimate than friendship.
- A relationship based on such knowledge: struck up an acquaintance with our new neighbor.
- A person whom one knows.
- Knowledge or information about something or someone: has a passing acquaintance with Chinese history.