addition.
The act of adding anything.
Meaning & usage
The act of adding anything.
The addition of five more items to the agenda will make the meeting unbearably long.
Anything that is added.
The arithmetic operation of adding.
A dot at the right side of a note as an indication that its sound is to be lengthened one half.
A title annexed to a person's name to identify him or her more precisely.
Something added to a coat of arms, as a mark of honour.
an organic reaction where two or more molecules combine to form a larger one (the adduct).
Where this word comes from
Etymology tree Proto-Indo-European *h₂éd Proto-Italic *ad Proto-Italic *ad- Latin ad- Proto-Indo-European *dʰeh₁- Proto-Indo-European *dʰéh₁tder. Proto-Italic *-ðō Latin -dō Latin addō Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin additiōder. Old French aditionder. Middle English addicioun English addition Sense of “what is added” dates from 14th century, from Middle English addicioun, addition, from Old French adition, from Latin additiōnem, accusative singular of additiō, from addō (“add, put”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.