<unk> , cooption, and preadaptation are related terms pertaining to shifts in the function of a trait.  For example, a trait can evolve because it served one particular function, but subsequently it may come to serve another.<unk> s are common in both anatomy and behavior. Bird feathers are a classic example: initially these evolved for temperature regulation, but later were adapted for flight.  Interest in<unk>  relates to both the process and product of evolution: the process that creates complex traits and the product that may be imperfectly designed.
Exaptation
Attachment 
Dissociation 
Supination
Perspiration
Emotional contagion
Affectional bond
Derealization