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Contagious (adjective)
Of a disease, easily transmitted to others.
“The flu was so contagious that everybody in town got sick!”
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Contagious (adjective)
Of a fashion, laughter, etc., easily passed on to others.
“Wearing jeans was a contagious fad at that time.”
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Contagious (adjective)
Of a person, having a disease that can be transmitted to another person by touch.
“They were highly contagious, spreading bacteria to other people.”
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Infectious (adjective)
Transmitted from one person to another, usually through the air breathed.
“Cancer is not infectious.”
“More infectious diseases like the flu are usually less potent.”
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Infectious (adjective)
Able to infect others.
“Despite feeling better, the patient is still infectious.”
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Infectious (adjective)
Spreading quickly from one person to another.
“Her enthusiasm for work can be really infectious.”
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Infectious (adjective)
Memorable and invoking excitement or interest.
“Pop music is more infectious than elevator music.”