1. Acquaintance, associate, companion, friend refer to a person with whom one is in contact. An acquaintance is someone recognized by sight or someone known, though not intimately: a casual acquaintance. An associate is a person who is often in one's company, usually because of some work, enterprise, or pursuit in common: a business associate. A companion is a person who shares one's activities, fate, or condition: a traveling companion; companion in despair. A friend is a person with whom one is on intimate terms and for whom one feels a warm affection: a trusted friend. 3. familiarity, awareness.