infectious

The definition of infectious is something that is likely to spread in a rapid manner, such as a contagious disease that spreads easily from person to person.

(adjective)

  1. If you have a cute and enthusiastic laugh that always gets other people to laugh along with you, this is an example of a time when you would be said to have an infectious laugh.
  2. The swine flu is an example of an infectious disease.

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See infectious in Webster's New World College Dictionary

adjective

  1. likely to cause infection; containing disease-producing organisms or matter
  2. designating a disease that can be communicated by infection (sense )
  3. tending to spread or to affect others; catching: an infectious laugh
  4. Obsolete infected with disease

Related Forms:

See infectious in American Heritage Dictionary 4

adjective
  1. Capable of causing infection.
  2. Caused by or capable of being transmitted by infection.
  3. Caused by a pathogenic microorganism or agent.
  4. Easily or readily communicated: an infectious laugh.

Related Forms:

  • in·fecˈtious·ly adverb
  • in·fecˈtious·ness noun

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