1. The sticking of two surfaces together (e.g. an orthodontic bracket to tooth enamel, or a denture to the roof of the mouth). Adhesive systems in restorative dentistry permit the bonding to dentine and enamel using an acid-etch technique.
2. The tissue that provides the pathological joining of two normally separate surfaces.
3. The healing process by which the edges of a wound are united. This may be primary with minimal granulation tissue or secondary when the edges are joined by granulation tissue. See also wound.