# diagnosis

> English word · Noun · IPA /daɪəɡˈnəʊsɪs/ · frequency rank #5,121

## Definitions
1. The process of, or an instance of, identification of the nature and cause of a medical condition or illness.
2. The process of, or an instance of, identification of the nature and cause of something (of any nature).
3. A written description of a species or other taxon serving to distinguish that species from all others; especially a description written and published in Latin.

## Etymology
From Latin diagnōsis, from Ancient Greek διάγνωσις (diágnōsis), from διαγιγνώσκω (diagignṓskō, “to discern”), from διά (diá, “through”) + γιγνώσκω (gignṓskō, “to know”).

## Easily confused with
- **diagnostic** (https://plainspell.com/en/vs/diagnosis-vs-diagnostic)
- **diagnostics** (https://plainspell.com/en/vs/diagnosis-vs-diagnostics)
- **diagnose** (https://plainspell.com/en/vs/diagnose-vs-diagnosis)
- **diagnoses** (https://plainspell.com/en/vs/diagnoses-vs-diagnosis)

## Common misspellings (13)
`daignosis`, `ddiagnosis`, `diaggnosis`, `diagnnosis`, `diagnoiss`, `diagnosiss`, `diagnossi`, `diagnossis`, `diagnsois`, `diagonsis`, `diangosis`, `diganosis`, `idagnosis`

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