Done vs Undefined - What's the difference?

As a verb done

is .

lacking a definition or value.

(en adjective)

(of food) Ready, fully cooked.

As soon as the potatoes are done we can sit down and eat.

In a state of having completed or finished an activity.

He pushed his empty plate away, sighed and pronounced "I am done ."

They were done playing and were picking up the toys when he arrived.

Being exhausted or fully spent.

When the water is done we will only be able to go on for a few days.

Without hope or prospect of completion or success.

He is done , after three falls there is no chance he will be able to finish.

Fashionable, socially acceptable, tasteful.

I can't believe he just walked up and spoke to her like that, those kind of things just aren't done !

What is the done thing these days? I can't keep up!

* be done for * be done with it * done deal * get done for * overdone * well done

(head)

I have ''done'' my work.

(African American Vernacular English, Southern American English, auxiliary verb, taking a past tense) Used in forming the perfective aspect.

I done did my best to raise y'all.

(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