Longman Dictionary of Contemporary English homepage

contagious

 adjective
     
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con‧ta‧gious
1MI a disease that is contagious can be passed from person to person by touch
2MI a person who is contagious has a disease that can be passed to another person by touch:
The patient is still highly contagious.
3 if a feeling, attitude, or action is contagious, other people are quickly affected by it and begin to have it or do it:
her contagious enthusiasm
—contagiousness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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