Later vs Undefined - What's the difference?

As a verb later

is .

lacking a definition or value.

(head)

(late)

You came in late yesterday and today you came in even later .

Afterward in time (used with than when comparing with another time).

My roommate arrived first. I arrived later .

I arrived later than my roommate.

At some unspecified time in the future.

I wanted to do it now, but I'll have to do it later .

* earlier

(head)

(late)

Jim was later than John.

Coming afterward in time (used with than when comparing with another time).

The Victorian era is a later period of English history than the Elizabethan era.

At some time in the future.

The meeting was adjourned to a later date.

* earlier

(head)

(slang) See you later; goodbye.

Later , dude.

(slang) Dismissive term to minimize importance of an annoying persons.

Frequently used with "for you". "Later for you."

* later days * later on * save for later * sooner or later

(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