1join or be joined securely to something else, typically by means of an adhesive substance, heat, or pressure: [with object]:press the material to bond the layers together [no object]:this material will bond well to stainless steel rods (as adjective bonding)a bonding agent
[no object] establish a relationship with someone based on shared feelings, interests, or experiences:the failure to properly bond with their childrenthe team has bonded together well (as noun bonding)the film has some great male bonding scenes
2join or be joined by a chemical bond.
3 [with object] (usually as adjective bonding) lay (bricks) in an overlapping pattern so as to form a strong structure:a bonding course
4 (usually as noun bonding) place (dutiable goods) in bond.