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[in-fek-shuh s] /ɪnˈfɛk ʃəs/

communicable by , as from one person to another or from one part of the body to another:
infectious diseases.
causing or communicating .
tending to spread from one to another:
infectious laughter.
Law. capable of contaminating with illegality; exposing to seizure or forfeiture.
Obsolete. .
(of a disease) capable of being transmitted Compare contagious
(of a disease) caused by microorganisms, such as bacteria, viruses, or protozoa
causing or transmitting infection
tending or apt to spread, as from one person to another: infectious mirth
(international law)


“catching, having the quality of spreading from person to person,” 1540s of diseases, 1610s of emotions, actions, etc.; see infect + -ous.

infectious in·fec·tious (ĭn-fěk’shəs)

in·fec’tious·ness n.
Capable of causing infection. See Note at contagious.


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