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The Collaborative International Dictionary of English v.0.48 (gcide)

Infectious \In*fec"tious\, a. [Cf. F. infectieux.]
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1. Having qualities that may infect; communicable or caused
by infection; pestilential; epidemic; as, an infectious
fever; infectious clothing; infectious water; infectious
vices.
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Where the infectious pestilence. --Shak.
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2. Corrupting, or tending to corrupt or contaminate;
vitiating; demoralizing.
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It [the court] is necessary for the polishing of
manners . . . but it is infectious even to the best
morals to live always in it. --Dryden.
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3. (Law) Contaminating with illegality; exposing to seizure
and forfeiture.
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Contraband articles are said to be of an infectious
nature. --Kent.
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4. Capable of being easily diffused or spread; sympathetic;
readily communicated; as, infectious mirth.
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The laughter was so genuine as to be infectious.
--W. Black.

Syn: See {Contagious}.
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