Contagious vs Undefined - What's the difference?

As adjectives the difference between contagious and undefined

is that contagious is of a disease, easily transmitted to others while undefined is lacking a definition or value.

(wikipedia contagious)

(en adjective)

Of a disease, easily transmitted to others.

The flu was so contagious that everybody in town got sick!

Of a fashion, laughter, etc., easily passed on to others.

Wearing jeans was a contagious fad at that time.

Of a person, having a disease that can be transmitted to another person by touch.

They were highly contagious , spreading bacteria to other people.

* (of a disease) catching, infectious * infectious

* non-contagious

* contagiousness * contagion

(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined