The difference between Reduction and Supplement

Reduction as a noun:

The act, process, or result of reducing.

Reduction as a noun:

The amount or rate by which something is reduced, e.g. in price.

Reduction as a noun (chemistry):

A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen.

Reduction as a noun (cooking):

The process of rapidly boiling a sauce to concentrate it.

Reduction as a noun (mathematics):

The rewriting of an expression into a simpler form.

Reduction as a noun (computability theory):

a transformation of one problem into another problem, such as mapping reduction or polynomial reduction.

Reduction as a noun (music):

An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera.

Reduction as a noun (philosophy, phenomenology):

A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.)

Reduction as a noun (medicine):

A medical procedure to restore a fracture or dislocation to the correct alignment.

Supplement as a noun:

Something added, especially to make up for a deficiency.

Supplement as a noun:

An extension to a document or publication that adds information, corrects errors or brings up to date.

Supplement as a noun:

An additional section of a newspaper devoted to a specific subject.

Supplement as a noun (geometry):

An angle that, when added to a given angle, makes 180; a supplementary angle.

Supplement as a noun (nutrition, bodybuilding):

A vitamin, herbal extract or chemical compound ingested to meet dietary deficiencies or enhance muscular development.

Supplement as a verb:

To provide or make a supplement to something.