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Definition of addendum : A thing to be added; an appendix or addition.

Synonyms:

concomitant, postscript, supplement, supplementation, add-on

auxiliary, secondary, extra, companion, lieutenant, appendage, accessory, consort, appendix, accompaniment, extension, adjunct, appurtenance, addition, garnish, ornament, second, adornment, fixture, brother, attachment

augmentation, enlargement, annex, amalgamation, increase, swelling, inflation

Usage examples:

• In other addendum references parts one and three are combined under the title of Lost Illusions. - "Two Poets Lost Illusions Part I", Honore de Balzac.
• On the hither side of one of the two streets close under him, his office- the old, first one, reopened on his return- stood closed, the sign renovated and tacked up once more, and the early addendum, Gentleman, still asserting itself, firmly though modestly, beneath the new surface of repair. - "John March, Southerner", George W. Cable.
• In July 1820 Shelley wrote to Keats himself on the subject, furnishing almost the only addendum which could have been needed to the preceding remarks: " I have lately read your 'Endymion' again, and even with a new sense of the treasures of poetry it contains, though treasures poured forth with indistinct profusion." - "Life of John Keats", William Michael Rossetti.