Meaning of infectious

in•fec•tious

Pronunciation: (in-fek'shus), [key]
— adj.
  1. communicable by infection, as from one person to another or from one part of the body to another: infectious diseases.
  2. causing or communicating infection.
  3. tending to spread from one to another: infectious laughter.
  4. capable of contaminating with illegality; exposing to seizure or forfeiture.
  5. diseased.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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