diagnosis

/daɪəɡˈnəʊsɪs/

//daɪəɡˈnəʊsɪs// noun

By · According to Wiktionary data (CC BY-SA) ·

"diagnosis" is a 9-letter English headword indexed on PlainSpell.

The verdict

“diagnosis” has 13 generated spelling variants in the English index at frequency #5,121. The variants make it a useful spelling check.

#5,121
frequency rank, English
26,416
“D” headwords
13
tracked misspellings
4
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The process of, or an instance of, identification of the nature and cause of a medical condition or illness.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

diagnosis vs diagnostic
80% similar
diagnosis vs diagnostics
82% similar
diagnosis vs diagnose
78% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for diagnosis
PropertyValue
Headworddiagnosis
LanguageEnglish
Part of speechNoun
IPA/daɪəɡˈnəʊsɪs/
Letters9
Frequency rank#5,121
Misspellings tracked13
Confusable pairs4
SourceWiktionary (kaikki.org)

Where “diagnosis” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). diagnosis lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around diagnosis (IPA /daɪəɡˈnəʊsɪs/), anoun. Corpus frequency is #5,121 among 26,416 “D” headwords. Wiktionary lists 3 senses, so context still picks the gloss.

Our generated misspelling index lists 13 likely wrong-spelling variants for diagnosis, with forms such as "daignosis", "ddiagnosis", and "diaggnosis". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 4 confusable-pair relationships, "diagnostic", "diagnostics", "diagnose", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Latin diagnōsis, from Ancient Greek διάγνωσις (diágnōsis), from διαγιγνώσκω (diagignṓskō, “to discern”), from διά (diá, “through”) + γιγνώσκω (gignṓskō, “to know”). The correct English form is diagnosis, spelled D-I-A-G-N-O-S-I-S.

Definition

  1. 1
    The process of, or an instance of, identification of the nature and cause of a medical condition or illness.
  2. 2
    The process of, or an instance of, identification of the nature and cause of something (of any nature).
  3. 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”).

This word in other languages

diagnóstico(Español)diagnostic(Français)Diagnose(Deutsch)diagnóstico(Português)

Common misspellings

Also misspelled as:

  • daignosis
  • ddiagnosis
  • diaggnosis
  • diagnnosis
  • diagnoiss
  • diagnosiss
  • diagnossi
  • diagnossis
  • diagnsois
  • diagonsis
  • diangosis
  • diganosis
  • idagnosis

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of diagnosis - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

daignosis2ddiagnosis1diaggnosis1diagnnosis1diagnoiss2diagnosiss1diagnossi2diagnossis1
Edit distance from "diagnosis"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "diagnosis"?
"diagnosis" is spelled D-I-A-G-N-O-S-I-S. The IPA pronunciation is /daɪəɡˈnəʊsɪs/.
What does "diagnosis" mean?
As a noun, "diagnosis" means: The process of, or an instance of, identification of the nature and cause of a medical condition or illness.
What words are commonly confused with "diagnosis"?
"diagnosis" is commonly confused with "diagnostic", "diagnostics", "diagnose". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "diagnosis"?
The IPA (International Phonetic Alphabet) transcription for "diagnosis" is /daɪəɡˈnəʊsɪs/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "diagnosis"?
From Latin diagnōsis, from Ancient Greek διάγνωσις (diágnōsis), from διαγιγνώσκω (diagignṓskō, “to discern”), from διά (diá, “through”) + γιγνώσκω (gignṓskō, “to know”). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “diagnosis”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is D-I-A-G-N-O-S-I-S - every other letter order is a misspelling in standard orthography.
  • Say it as /daɪəɡˈnəʊsɪs/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “diagnostic” - see the side-by-side comparison. diagnosis vs diagnostic
  • Browse more English words and confusable pairs in the same reference. English words

Same frequency band

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list