Supplemental vs. Addendum — What's the Difference?

Provided in addition to what is already present or available to complete or enhance it

An addendum or appendix, in general, is an addition required to be made to a document by its author subsequent to its printing or publication. It comes from the Latin gerundive addendum, plural addenda, "that which is to be added," from addere (lit. ''give toward'', compare with memorandum, agenda, corrigenda).

Something added to complete a thing, make up for a deficiency, or extend or strengthen the whole.

An item of additional material added at the end of a book or other publication.

A section added to a book or document to give further information or to correct errors.

The radial distance from the pitch circle of a cogwheel or wormwheel to the crests of the teeth or ridges.

A separate section devoted to a special subject inserted into a periodical, such as a newspaper.

Something added or to be added, especially a supplement to a book.

See dietary supplement.

Something to be added; especially text added as an appendix or supplement to a document.

See supplementary angle.

A postscript.

To provide or form a supplement to.

(engineering) The height by which the tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line.

Acting to supplement.

A thing to be added; an appendix or addition.

Appending.

Textual matter that is added onto a publication; usually at the end

Lacking a regular schedule (as in a supplemental airline).

Something that supplements or adds to.

A requisition or article of legislation that provides additional funding for a program.

Added to supply what is wanted; additional; being, or serving as, a supplement; as, a supplemental law; a supplementary sheet or volume.

Functioning in a subsidiary or supporting capacity;

Added to complete or make up a deficiency;