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infectious (adj.)

"catching, having the quality of spreading from person to person, communicable by infection," 1540s of diseases, 1610s of emotions, actions, etc.; see infection + -ous. Earlier in the same sense were infectuous (late 15c.), infective (late 14c.). Related: Infectiously; infectiousness.

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Definitions of infectious

infectious (adj.)
caused by infection or capable of causing infection;
Synonyms: infective
infectious (adj.)
easily spread; "fear is exceedingly infectious; children catch it from their elders"- Bertrand Russell;
infectious (adj.)
of or relating to infection;
infectious hospital
infectious disease
From wordnet.princeton.edu