1. the branch of medicine treating of the essential nature of disease, especially of the changes in body tissues and organs that cause or are caused by disease. 2. the structural and functional manifestations of a disease. adj., adj pathologÂ´ic, pathologÂ´ical.
The definition of receptive is someone who is open and willing to receive something or to hear or learn something new. 1  An example of someone who would be described as receptive is a person who is open and willing to hear a new idea. An example of someone who would be described as receptive is an audience of people who are willing to welcome a speaker and listen with an open mind.
Reciprocity (social psychology) In social psychology, reciprocity is a social rule that says people should repay, in kind, what another person has provided for them; that is, people give back (reciprocate) the kind of treatment they have received from another. By virtue of the rule of reciprocity, people are obligated to repay favors, gifts, invitations, etc. in the future.