Jacobian
/jɑːˈkəʊ.bi.ən/
"jacobian" is a 8-letter English headword indexed on PlainSpell.
The verdict
“Jacobian” is uncommon English (frequency #88,478 among 4,872 “J” headwords), classed as an adjective. The kind of spelling people second-guess.
- #88,478
- frequency rank, English
- 4,872
- “J” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Used to specify certain mathematical objects named in honour of C. G. J. Jacobi.
Corpus desk
Index EN-jacobian · Jacobian · English
Jacobian · rank #88,478 · 0 variants · 0 confusables
- FREQ-RARE #88,478
- LEN-LONG 8 letters
- VOW-4 4 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 4,872
- PHOTO-FINISH jailor
Nearest frequency peer: jailor (+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.
Frequency neighbourhood for “Jacobian”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- involution
involution
11,530 corpus weight
- isolator
isolator
11,525 corpus weight
- Jacobian
Jacobian
11,523 corpus weight
- jailor
jailor
11,522 corpus weight
- Jair
Jair
11,521 corpus weight
- Jairus
Jairus
11,520 corpus weight
What this shows Bars show where “Jacobian” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | Jacobian |
| Language | English |
| Part of speech | Adjective |
| IPA | /jɑːˈkəʊ.bi.ən/ |
| Letters | 8 |
| Frequency rank | #88,478 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “Jacobian” sits in English frequency
Rare enough to double-check
Jacobian is uncommon English at frequency #88,478 among 4,872 “J” headwords, classed as anadjective, transcribed /jɑːˈkəʊ.bi.ən/. Rarity is why readers land here mid-draft. Gloss: "Used to specify certain mathematical objects named in honour of C. G. J. Jacobi.".
Jacobian doesn't appear in our generated misspelling index, and the word's spelling is regular enough that our generator found nothing worth flagging. This entry stands alone in our confusable dataset, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: From Jacobi + -an, after Carl Gustav Jacob Jacobi, a German mathematician of the 19th century. The correct English form is Jacobian, spelled J-A-C-O-B-I-A-N.
Definition
- 1Used to specify certain mathematical objects named in honour of C. G. J. Jacobi.
Etymology
From Jacobi + -an, after Carl Gustav Jacob Jacobi, a German mathematician of the 19th century.
This word in other languages
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.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 6, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "Jacobian", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 8 letters (nearest by frequency rank).
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.