# addition

> English word · Noun · IPA /əˈdɪʃ.ən/ · frequency rank #1,037

## Definitions
1. The act of adding anything.
2. Anything that is added.
3. The arithmetic operation of adding.
4. A dot at the right side of a note as an indication that its sound is to be lengthened one half.
5. A title annexed to a person's name to identify him or her more precisely.
6. Something added to a coat of arms, as a mark of honour.
7. an organic reaction where two or more molecules combine to form a larger one (the adduct).

## Etymology
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
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”).

## Easily confused with
- **adoption** (https://plainspell.com/en/vs/addition-vs-adoption)
- **ambition** (https://plainspell.com/en/vs/addition-vs-ambition)
- **audition** (https://plainspell.com/en/vs/addition-vs-audition)
- **additive** (https://plainspell.com/en/vs/addition-vs-additive)
- **additions** (https://plainspell.com/en/vs/addition-vs-additions)
- **additional** (https://plainspell.com/en/vs/addition-vs-additional)
- **Addison** (https://plainspell.com/en/vs/addison-vs-addition)
- **adaption** (https://plainspell.com/en/vs/adaption-vs-addition)
- **addiction** (https://plainspell.com/en/vs/addiction-vs-addition)

## Common misspellings (10)
`addiiton`, `addision`, `additino`, `additionn`, `additoin`, `addittion`, `addtiion`, `adidtion`, `adition`, `dadition`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/addition