Contagion refers to the rapid transmission of emotions or behaviors through a crowd
Other /More definition:
Contagion may be defined as;.
(1) the spread of behaviors, attitudes, and affect through crowds and other types of social aggregations from one member to another;.
(2) the phenomenon in which an individual exposed to a suggestion will act on it.
(3) the disease transmission by direct or indirect contact.
Lexicon of Psychology - Terms, Treatments, Biographies,