1. A close acquaintance, association, or familiarity with someone or other people: Jerry had a close intimateness or friendship with his sister, Elizabeth, when they were children and even after they had grown up and married separate spouses.
2. A relationship that involves informality and friendliness: The physical trainers at Bill's fitness studio expressed a great deal of intimateness with their members.
3. Women's clothing that is worn next to the skin and under outer garments: Joan was going to a store that sells apparel that specializes in intimateness for those who are wearing such garments.