SOME THING THAT CAN BE PASSED ON SUCH AS AN ILLNESS, LIKE THE FLU.In terms of human geo. it is the distance-controlled spreading of an idea, innovation, or some other item through a local population...
Contagious means that the infection is spread from one person to another by direct or indirect contact. This would mean that an illness you can 'catch' from some is contagious... such as influenza or...