The state of feeling sad or dejected as a result of lack of companionship or being separated from others.

The separation of individuals or groups resulting in the lack of or minimizing of social contact and/or communication. This separation may be accomplished by physical separation, by social barriers and by psychological mechanisms. In the latter, there may be interaction but no real communication.

Techniques to reveal personality attributes by responses to relatively unstructured or ambiguous stimuli.

The reciprocal interaction of two or more persons.

A legal concept for individuals who are designated to act on behalf of persons who are considered incapable of acting in their own behalf, e.g., minors and persons found to be not mentally competent.

Support systems that provide assistance and encouragement to individuals with physical or emotional disabilities in order that they may better cope. Informal social support is usually provided by friends, relatives, or peers, while formal assistance is provided by churches, groups, etc.

I'm sorry for any confusion, but "Chicago" is a specific location and a major city in the United States, not a medical term or condition with a defined meaning within the medical field. Therefore, it doesn't have a medical definition in a singular sentence or otherwise. If you have any questions related to healthcare, medicine, or medical terminology, I would be happy to help answer those!

The perceiving of attributes, characteristics, and behaviors of one's associates or social groups.