| n. | 1. | (Med.) The transmission of a disease from one person to another, by direct or indirect contact. |
| 2. | That which serves as a medium or agency to transmit disease; a virus produced by, or exhalation proceeding from, a diseased person, and capable of reproducing the disease. | |
| 3. | The act or means of communicating any influence to the mind or heart; | |
| 4. | Venom; poison. |
| Noun | 1. | contagion - any disease easily transmitted by contact Synonyms: contagious disease |
| 2. | contagion - an incident in which an infectious disease is transmitted Synonyms: infection, transmission | |
| 3. | contagion - the communication of an attitude or emotional state among a number of people; "a contagion of mirth"; "the infection of his enthusiasm for poetry" Synonyms: infection |