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infectious

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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)

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.
The swine flu is an example of an infectious disease.

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See infectious in Webster's New World College Dictionary

adjective

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

Related Forms:

infectiously adverb
infectiousness noun

See infectious in American Heritage Dictionary 4

adjective

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

Related Forms:

in·fecˈtious·ly adverb

in·fecˈtious·ness noun

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