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Noun: contagiousness  kun'tey-jus-nus
  1. The state or condition of being contagious, easily transmitted to others.
    "Without factoring in the contagiousness of a disease, we will probably underestimate the effect that curing someone with a given disease may have."
  2. Quality of being contagious

Type of: harmfulness, noisomeness, noxiousness