# adjuvant

> English word · Adjective · IPA /ˈæd͡ʒʊv(ə)nt/ · frequency rank #48,043

## Definitions
1. Providing assistance or help; assistive, facilitative, helpful.
2. Enhancing the immune response to an antigen; also, containing a substance having such an effect.
3. Of a form of therapy or treatment: additional, supplementary; specifically (oncology), of a cancer treatment: given after removal of a primary tumour.

## Etymology
Learned borrowing from Latin adiuvant-, adjuvant- + English -ant (suffix forming adjectives with the sense ‘exhibiting a condition or process’; and forming agent nouns). Adiuvant-, adjuvant- are oblique stems of adiuvāns, adjuvāns (“assisting, helping”), the present active participle of adiuvō (“to assist, help; to be useful; etc.”), from ad- (“prefix meaning ‘to; toward’”) + iuvō (“to aid, help; to save”) (possibly from Proto-Indo-European *h₁ewH- (“to assist, help; to save”)).
Adjective adjective sense 3 (“of a form of therapy or treatment: additional, supplementary”) and noun noun sense 1.4 (“additive which aids or modifies the action of the principal ingredient of a drug”) are possibly derived from French adjuvant (adjective, noun).

## Easily confused with
- **adjutant** (https://plainspell.com/en/vs/adjutant-vs-adjuvant)

## Common misspellings (12)
`addjuvant`, `adjjuvant`, `adjuavnt`, `adjuvannt`, `adjuvantt`, `adjuvatn`, `adjuvnat`, `adjuvvant`, `adjvuant`, `adujvant`, `ajduvant`, `dajuvant`

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