Additive vs Undefined - What's the difference?

As a noun additive

is .

lacking a definition or value.

(en adjective)

(mathematics) Pertaining to addition; that can be, or has been, added.

over addition.

Matrix multiplication is additive in that $M\vec v+M\vec w=M(\vec v+\vec w)$ .

(algebra) Having addition as an operator.

It is natural to look at a finite cyclic group as an additive group.

(chemistry) Pertaining to chemical addition.

(genetics) Describing genes (or the interaction etc. of such genes) which govern the same trait and whose effects work together on the phenotype.

* subtractive

* additive function * additive inverse * additive identity * additive group * additive color

(en noun)

A substance added to another substance or product for its ability to alter its properties.

Oil may be used as an additive in gasoline to improve the lubrication of a small engine.

(grammar) A word or phrase that adds something, such as also'', ''even'', or ''nor .

* * ----

(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