Definition of "infectiousness" [in•fec•tious•ness]

• The state or condition of being infectious. (noun)

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• "He had from time to time during his existence witnessed the so-called infectiousness of laughter, but never before had he participated in it."
• "Thus, for example, arguing from what may be called the infectiousness of personal acts or states, the Galelareese say that you ought not to shoot with a bow and arrows under a fruit-tree, or the tree will cast its fruit even as the arrows fall to the ground; and that when you are eating water-melon you ought not to mix the pips which you spit out of your mouth with the pips which you have put aside to serve as seed; for if you do, though the pips you spat out may certainly spring up and blossom, yet the blossoms will keep falling off just as the pips fell from your mouth, and thus these pips will never bear fruit."
• "We like to use words like contagiousness and infectiousness just to apply to the medical realm."