ontology

/ɒnˈtɒləd͡ʒi/

//ɒnˈtɒləd͡ʒi// noun

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

"ontology" is a 8-letter English headword indexed on PlainSpell.

The verdict

“ontology” has 12 generated spelling variants in the English index at frequency #31,275. The variants make it a useful spelling check.

#31,275
frequency rank, English
1,431
“O” headwords
12
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being.

Corpus desk

Index EN-ontology · ontology · English

ontology · rank #31,275 · 12 variants · 1 confusable

  • FREQ-MID #31,275
  • LEN-LONG 8 letters
  • VOW-4 4 vowels
  • CONFUS-LOW 1 pairs
  • VAR-MID 12 variants
  • BOOK-MID 1,431
  • PHOTO-FINISH OPM

Nearest frequency peer: OPM (+1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “ontology”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “ontology” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

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

ontology vs oncology
88% similar

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

Key facts for ontology
PropertyValue
Headwordontology
LanguageEnglish
Part of speechNoun
IPA/ɒnˈtɒləd͡ʒi/
Letters8
Frequency rank#31,275
Misspellings tracked12
Confusable pairs1
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “ontology”

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

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “OPM” (#31,276), “ocular” (#31,273), “oratory” (#31,277). Among 1,431 “O” headwords, “ontology” is #31,275. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 12 spelling variants around ontology (IPA /ɒnˈtɒləd͡ʒi/), anoun. Corpus frequency is #31,275 among 1,431 “O” headwords. Wiktionary lists 5 senses, so context still picks the gloss.

Our generated misspelling index lists 12 likely wrong-spelling variants for ontology, with forms such as "notology", "onntology", and "onotlogy". 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 1 confusable-pair relationship, "oncology", since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: Learned borrowing from New Latin ontologia (1606, Ogdoas Scholastica, by Jacob Lorhard (Lorhardus)), from Ancient Greek ὤν, ὄντος (ṓn, óntos, “being”), present participle of εἰμί (eimí, “being, existing, essence”) + λόγος (lógos, “account”). By surface anal… The correct English form is ontology, spelled O-N-T-O-L-O-G-Y.

Definition

  1. 1
    The branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being.
  2. 2
    In a subject view, or a world view, the set of conceptual or material things or classes of things that are recognised as existing, or are assumed to exist in context, and their interrelations; in a body of theory, the ontology comprises the domain of discourse, the things that are defined as existing, together with whatever emerges from their mutual implications.
  3. 3
    The theory of a particular philosopher or school of thought concerning the fundamental types of entity in the universe.
  4. 4
    A logical system involving theory of classes, developed by Stanislaw Lesniewski (1886-1939).
  5. 5
    A structure of concepts or entities within a domain, organized by relationships; a system model.

Recorded use

Wiktionary examples

These source excerpts show how ontology appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. [Martin] Heidegger's concern […] was with ontology, the nature of beings, above all humans. The central question for him was "What is being? What is it for something to be?" He tackled this question not by way of the sciences, but by way of an examination of our prescientific daily life. We are, he argued, not cut off from the world by our mental processe…
  2. Meronym: taxonomy

Etymology

Learned borrowing from New Latin ontologia (1606, Ogdoas Scholastica, by Jacob Lorhard (Lorhardus)), from Ancient Greek ὤν, ὄντος (ṓn, óntos, “being”), present participle of εἰμί (eimí, “being, existing, essence”) + λόγος (lógos, “account”). By surface analysis, onto- + -logy. First known English use 1663: Archelogia philosophica nova; or, New principles of Philosophy. Containing Philosophy in general, Metaphysicks or Ontology, Dynamilogy or a Discourse of Power, Religio Philosophi or Natural Theology, Physicks or Natural philosophy, by Gideon Harvey (1636–1702), London, Thomson, 1663. Popularized as a philosophical term by German philosopher Christian Wolff (1679–1754).

This word in other languages

ontología(Español)ontologie(Français)Ontologie(Deutsch)

Common misspellings

Also misspelled as:

  • notology
  • onntology
  • onotlogy
  • ontloogy
  • ontolgoy
  • ontollogy
  • ontologgy
  • ontologyy
  • ontoloyg
  • ontoolgy
  • onttology
  • otnology

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of ontology - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

notology2onntology1onotlogy2ontloogy2ontolgoy2ontollogy1ontologgy1ontologyy1
Edit distance from "ontology"

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 "ontology"?
"ontology" is spelled O-N-T-O-L-O-G-Y. The IPA pronunciation is /ɒnˈtɒləd͡ʒi/.
What does "ontology" mean?
As a noun, "ontology" means: The branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being.
What words are commonly confused with "ontology"?
"ontology" is commonly confused with "oncology". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "ontology"?
The IPA (International Phonetic Alphabet) transcription for "ontology" is /ɒnˈtɒləd͡ʒi/. 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 "ontology"?
Learned borrowing from New Latin ontologia (1606, Ogdoas Scholastica, by Jacob Lorhard (Lorhardus)), from Ancient Greek ὤν, ὄντος (ṓn, óntos, “being”), present participle of εἰμί (eimí, “being, existing, essence”) + λόγος (lógos, “account”). By su... 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "ontology", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 8 letters (nearest by frequency rank).

Nepalese#31,266rehearse#31,313Langford#31,236labourer#31,235

Similar misspelling depth

Headwords with a similar count of attested misspellings (12 here; floor ≥5).

McCullough12 variantsmausoleum12 variantsrepellent12 variantsreproach12 variants

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

Source: FrequencyWords open word-frequency list