con ‧ ta ‧ gious /kənˈteɪdʒəs/ BrE AmE adjective
1 . a disease that is contagious can be passed from person to person by touch ⇨ infectious
2 . a person who is contagious has a disease that can be passed to another person by touch ⇨ infectious :
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 ⇨ infectious :
her contagious enthusiasm
—contagiousness noun [uncountable]