Shunt vs Undefined - What's the difference?

As a verb shunt

is (obsolete|uk|dialect) to turn away or aside.

is a switch on a railway.

lacking a definition or value.

(en verb)

(obsolete, UK, dialect) To turn away or aside.

(obsolete, UK, dialect) To cause to move suddenly; to give a sudden start to; to shove.

(Ash)

To move a train from one track to another, or to move carriages etc from one train to another.

To divert electric current by providing an alternative path.

To divert the flow of a body fluid using surgery.

To move data in memory to a physical disk.

(informal, British) To have a minor collision, especially in a motor car.

To provide with a shunt.

to shunt a galvanometer

(wikipedia shunt) (en noun)

A switch on a railway

A connection used as an alternative path between parts of an electric circuit

A passage between body channels constructed surgically as a bypass

(informal, British) A minor collision

(firearms) The shifting of the studs on a projectile from the deep to the shallow sides of the grooves in its discharge from a shunt gun.

(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