addition
noun
ad·di·tion ə-ˈdi-shən 
a-
1
: a part added (as to a building or residential section)
The addition expanded the kitchen.
2
: anything or anyone added : increase
The clerk was a recent addition to the staff.
3
: the act or process of adding
a recipe enhanced by the addition of freshly ground pepper
especially : the operation of combining numbers so as to obtain an equivalent simple quantity
schoolchildren learning about addition and subtraction
4
: direct chemical combination of substances into a single product
Synonyms
- annex
- extension
- penthouse
See all Synonyms & Antonyms 
Example Sentences
The children learned addition and subtraction. The museum's collection includes several new additions.
Recent Examples on the Web In addition to giving me independence, the technology has eased my wife’s caregiving role. 
Paul Amadeus Lane And Jim Meade, STAT, 16 Sep. 2022 In addition to de-escalation training and a new process for reviewing use-of-force incidents, the city agreed to create an awards program that recognizes officers who peacefully resolve potentially perilous encounters with civilians. Kimberly Kindy, Anchorage Daily News, 15 Sep. 2022 In addition to producing more of this compound, the snapdragon genes seem to have another beneficial effect: The tomatoes don’t soften and spoil as quickly as others. WIRED, 15 Sep. 2022 In addition to snacks, many branches offer after-school programming which ranges from homework help, to games, crafts, movies and teen hangout. Tony Roberts, Baltimore Sun, 15 Sep. 2022 In addition to skateboarding, Cyrus participates in other sports, including skimboarding, hiking and skydiving. Skyler Caruso, Peoplemag, 15 Sep. 2022 In addition to Santa Claus coming to downtown, the River Walk also will host a little Fiesta in the fall with El Rey Feo, a Day of the Dead parade that will stream on Peacock and more events, most of them free. René A. Guzman, San Antonio Express-News, 15 Sep. 2022 In addition to the still lifes, the exhibit includes portraits of Diaz and of Gabriel Joffe, her friend and co-curator of the exhibit. Jo Yurcaba, NBC News, 15 Sep. 2022 In addition to the two films, there's also the anime series Blade Runner: Black Lotus and a host of Blade Runner comics to tide you over until the new series premieres on Prime Video. Christian Holub, EW.com, 15 Sep. 2022 See More
Paul Amadeus Lane And Jim Meade, STAT, 16 Sep. 2022 In addition to de-escalation training and a new process for reviewing use-of-force incidents, the city agreed to create an awards program that recognizes officers who peacefully resolve potentially perilous encounters with civilians. Kimberly Kindy, Anchorage Daily News, 15 Sep. 2022 In addition to producing more of this compound, the snapdragon genes seem to have another beneficial effect: The tomatoes don’t soften and spoil as quickly as others. WIRED, 15 Sep. 2022 In addition to snacks, many branches offer after-school programming which ranges from homework help, to games, crafts, movies and teen hangout. Tony Roberts, Baltimore Sun, 15 Sep. 2022 In addition to skateboarding, Cyrus participates in other sports, including skimboarding, hiking and skydiving. Skyler Caruso, Peoplemag, 15 Sep. 2022 In addition to Santa Claus coming to downtown, the River Walk also will host a little Fiesta in the fall with El Rey Feo, a Day of the Dead parade that will stream on Peacock and more events, most of them free. René A. Guzman, San Antonio Express-News, 15 Sep. 2022 In addition to the still lifes, the exhibit includes portraits of Diaz and of Gabriel Joffe, her friend and co-curator of the exhibit. Jo Yurcaba, NBC News, 15 Sep. 2022 In addition to the two films, there's also the anime series Blade Runner: Black Lotus and a host of Blade Runner comics to tide you over until the new series premieres on Prime Video. Christian Holub, EW.com, 15 Sep. 2022 See More Word History
Etymology
Middle English addicioun, borrowed from Anglo-French addicion, borrowed from Latin additiōn-, additiō, from addi-, variant stem of addere "to add" + -tiōn-, -tiō, suffix of action nouns
First Known Use
14th century, in the meaning defined at sense 1
Phrases Containing addition
Kids Definition
addition
noun
ad·di·tion ə-ˈdi-shən
1
: the act or process of adding numbers to obtain their sum
2
: something added
an addition to a house
addition
noun
1
as in extension
a smaller structure added to a main building a new addition to the library providing space for an expanded video collection Synonyms & Similar Words
Relevance
- extension
- annex
- wing
- penthouse
- arm
- ell
2
as in increase
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 & Similar Words
- increase
- boost
- gain
- more
- plus
- raise
- augmentation
- increment
- rise
- supplement
- expansion
- addendum
- proliferation
- accrual
- step-up
- accretion
- continuation
- uptick
- accumulation
- complement
- collection
- extension
- appendix
- spike
- gathering
- jump
- upturn
- assemblage
- accession
- run-up
- uptrend
Antonyms & Near Antonyms
- reduction
- decrease
- lowering
- diminution
- lessening
- loss
- diminishment
- depletion
- decline
- shrinkage
- subtraction
- fall
- abatement
- decrement
- falloff
- deduction
- step-down
- drop-off
3
as in accumulating
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 & Similar Words
- increase
- accumulating
- accumulation
- multiplication
- proliferation
- doubling
- mushrooming
- expansion
- tripling
- growth
- quadrupling
- augmentation
- extension
- rise
- enlargement
- escalation
- lengthening
- cumulation
- increment
- amplification
- creep
- spread
- rise
- accretion
- boost
- inflation
- accrual
- gain
- distension
- distention
- hike
Antonyms & Near Antonyms
- decrease
- reduction
- lowering
- diminution
- lessening
- diminishing
- diminishment
- drop
- contracting
- contraction
- shrinking
- shrinkage
- condensing
- fall
- compression
- abatement
- constriction
- condensation
- compressing
- falloff
- shortening
- retrenchment
- constricting
- drop-off
- retrenching
Phrases Containing addition
- hemicellulose
- hemicelluloses
- hemicentrum
- hemicephalic
- hemicephalous
- hemicer
- hemicest
- Hemichorda
- Hemichordata
- hemichordate
- hemichordates
- hemicranias
- hemicryptophyte
- hemicryptophytic
- hemicrystalline
- hemictic
- hemicycle
- hemicycles
- hemicyclic
- hemidactylous
- Hemidactylus
- hemidemisemiquaver
- hemidemisemiquavers
- hemidome
- hemidystrophy