- (a.) Communicable by contact, by a virus or by a bodily exhalation; catching; as, a contagious disease.
- (a.) Conveying or generating disease; pestilential; poisonous; as, contagious air.
- (a.) Spreading or communicable from one to another; exciting similar emotions or conduct in others.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). contagious. Retrieved September 21, 2026, from http://smartdefine.org/contagious/definitions/1990887 |
| Chicago | Webster's. 2011. "contagious" http://smartdefine.org/contagious/definitions/1990887 (accessed September 21, 2026). |
| Harvard | Webster's 2011, contagious, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/contagious/definitions/1990887>. |
| MLA | Webster's. "contagious" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/contagious/definitions/1990887> |