Usual vs Undefined - What's the difference?

As adjectives the difference between usual and undefined

is that usual is most commonly occurring while undefined is lacking a definition or value.

(en adjective)

most commonly occurring

The preference of a boy to a girl is a usual occurrence in some parts of China.

It is becoming more usual these days to rear children as bilingual.

* common, wonted, normal, standard, regular, ordinary, plain, simple

* unusual

* usualness * usually * unusual * as usual

* *

(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