ETYM Latin, from addere to add.
(Irregular plural: addenda).
Textual matter that is added onto a publication; usually at the end; SYN. supplement, postscript.
Something added; appendix.
(Latin) Something to be added, usually in writing, which qualifies a foregoing thesis or statement.

A part that is joined to something larger.
Something attached to another thing as an extra or subsidiary part; hanger-on.

ETYM Latin complementun: cf. French complément. Related to Complete, Compliment.
1. Either of two parts that mutually complete each other.
2. Something added to complete or make perfect.
3. A word or phrase used to complete a grammatical construction.
4. A complete number or quantity.
5. Number needed to make up whole force; SYN. full complement.
6. One of a series of enzymes in the blood serum that are part of the immune response.
7. Full number or amount; addition that makes up full number; one of two equal things that complete each other; Grammar, addition to complete a predicate.
(Homonym: compliment). + prikaži više

ETYM French supplément, Latin supplementum, from supplere to fill up. Related to Supply.
A quantity added; e.g. to make up for a deficiency.