diagnose
/ˈdaɪ.əɡˌnoʊs/verb
diagnose is spelled D-I-A-G-N-O-S-E. The wrong spelling people search most is diagnoze: about 10 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 128 of all searches for the word. Diagnose is a verb meaning “To determine which disease is causing a sick person's signs and symptoms; to find the diagnosis”.
How do you spell diagnose?
Diagnose is spelled D-I-A-G-N-O-S-E. One wrong spelling is searched or written often enough to measure; together they are about 1 in 128 of the searches for diagnose in either form.
Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.
What does diagnose mean?
verb
- 1
To determine which disease is causing a sick person's signs and symptoms; to find the diagnosis.
- 2
To determine the cause of a problem.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you pronounce diagnose?
- UK /ˈdʌɪ.əɡˌnəʊz/
- UK /ˌdʌɪ.əɡˈnəʊz/
- US /ˈdaɪ.əɡˌnoʊs/
Diagnose has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-diagnose.wav, Wikimedia Commons (author and licence on each file's page).
Forms of diagnose
- diagnoses present, singular, he/she/it
- diagnosing participle, present
- diagnosed participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is diagnose?
Diagnose appears 2.6 times per million words in written English, the 16,896th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Diagnose in Spanish, French, German and Portuguese
In the sense determine the root cause of:
| Language | Words |
|---|---|
| French | diagnostiquer |
| German | diagnostizieren |
| Portuguese | diagnosticar |
| Spanish | diagnosticar |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does diagnose come from?
Back-formation from diagnosis.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).