addendum

1 a part added at the end of a book or periodical <there's an addendum from the author to explain certain stylistic choices that she made> Synonyms afterword, appendix, codicil, excursus, supplement Related Words coda, epilogue (also epilog), postlude; conclusion, ending, finale; accompaniment, addition, complement, postscript; follow-up, sequel; documentation; allonge, rider Antonyms foreword, introduction, preface, prologue (also prolog)

2 something added (as by growth) <with each new addendum the list of demands simply got more absurd> Synonyms accretion, accrual, increase, addition, augmentation, boost, expansion, gain, increment, more, plus, proliferation, raise, rise, step-up, supplement, uptickRelated Words accumulation, assemblage, collection, gathering; complement; accession, appendix, continuation, extension, uptrend, upturn; jump, run-up, spikeNear Antonyms deduction, subtractionAntonyms abatement, decline, decrease, decrement, depletion, diminishment, diminution, drop-off, fall, falloff, lessening, loss, lowering, reduction, shrinkage, step-down