extensional
"extensional" is a 11-letter English headword indexed on PlainSpell.
The verdict
“extensional” is uncommon English (frequency #84,233 among 2,246 “E” headwords), classed as an adjective. The kind of spelling people second-guess.
- #84,233
- frequency rank, English
- 2,246
- “E” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Of or pertaining to extension.
Corpus desk
Index EN-extensional · extensional · English
extensional · rank #84,233 · 0 variants · 0 confusables
- FREQ-RARE #84,233
- LEN-MEGA 11 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 2,246
- PHOTO-FINISH extensibility
Nearest frequency peer: extensibility (-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.
Long-tail ranks near “extensional”
Sparse band: bars invert rank so rarer forms read shorter
- eventuate
eventuate
15,776 corpus weight
- expropriate
expropriate
15,770 corpus weight
- extensibili…
extensibility
15,769 corpus weight
- extensional
extensional
15,768 corpus weight
- FATT
FATT
15,764 corpus weight
- faubourg
faubourg
15,763 corpus weight
What this shows Long-tail view: where “extensional” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | extensional |
| Language | English |
| Part of speech | Adjective |
| Letters | 11 |
| Frequency rank | #84,233 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “extensional” in English
Rare enough to double-check
extensional is uncommon English at frequency #84,233 among 2,246 “E” headwords, classed as anadjective. Rarity is why readers land here mid-draft. 2 senses are on record.
extensional doesn't appear in our generated misspelling index, a sign its spelling follows regular English conventions. No confusable counterpart is on file for this word, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From extension + -al. The correct English form is extensional, spelled E-X-T-E-N-S-I-O-N-A-L.
Definition
- 1Of or pertaining to extension.
- 2Having great extent.
Recorded use
Wiktionary exampleThese source excerpts show how extensional appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
In both the intensional and extensional logic traditions, we see theories of complex terms. In the extensional tradition, disjunctive and conjunctive terms are interpreted by taking the union and intersection of classes. The conjunctive term AB is interpreted as the intersection of the class A and the class B and the extension of the disjunctive term A+B…
Etymology
From extension + -al.
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
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "extensional", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 11 letters (nearest by frequency rank).