the GNU version of the Collaborative International Dictionary of English
n. The quality of being transmissible.
The Century Dictionary and Cyclopedia
n. In physical, transmitting power, specifically for radiation, of a substance or medium; perviousness or diathermancy.
n. The character of being transmissible.
Word Usage
"Smith gestures toward a definition of epidemics that focuses on its transmissibility, via communication or transportation lines, though in some cases, the term comes awfully close to existing in the eye of the beholder."