addition

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noun

Definition of ADDITION

1

a smaller structure added to a main building <a new addition to the library providing space for an expanded video collection>

Synonyms addition, extension, penthouse

Related Words arm, ell, wing

2

something added (as by growth) <the cache of old stamps I found in the discarded desk was a huge addition to my stamp collection>

Synonyms accretion, accrual, addendum, addition, augmentation, boost, expansion, gain, increment, more, plus, proliferation, raise, rise, step-up, supplement, uptick

Related Words accumulation, assemblage, collection, gathering; complement; accession, appendix, continuation, extension, uptrend, upturn; jump, run-up, spike

Near Antonyms deduction, subtraction

Antonyms abatement, decline, decrease, decrement, depletion, diminishment, diminution, drop-off, fall, falloff, lessening, loss, lowering, reduction, shrinkage, step-down

3

the act or process of becoming greater in number <how do you account for the addition of more paint stains on your shirt after you put on a smock?>

Synonyms accumulating, accumulation, addition, increase, mushrooming, proliferation

Related Words doubling, quadrupling, tripling; creep, growth, rise, spread; enlargement, escalation, expansion; amplification, distension (or distention), inflation; accretion, accrual, augmentation, cumulation; extension, lengthening; boost, gain, hike, increment, rise

Near Antonyms abatement, compressing, compression, condensation, condensing, constricting, constriction, contracting, contraction, diminishing, diminishment, diminution, drop, drop-off, fall, falloff, lessening, lowering, reduction, shrinkage, shrinking; retrenching, retrenchment, shortening

Antonyms decrease