attachment [Fr, attachement] , 1. the state or quality of being affixed or attached. 2. (in psychiatry) a mode of behavior in which one individual relates in an affiliative or dependent manner to another; a feeling of affection or loyalty that binds one person to another. See also bonding. 3. (in dentistry) any device, such as a retainer or artificial crown, used to secure a partial denture to a natural tooth in the mouth. 4. (in periodontology) the fixation of periodontal tissues to alveolar bone and tooth structure.
