ISBN
The verdict
“ISBN” is a moderately-common Portuguese word, ranked #11,899 in Portuguese word frequency and used as an abbreviation.
- #11,899
- frequency rank, Portuguese
- 4
- letters
- 6
- tracked misspellings
- 7
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - sigla formada com as iniciais de International Standard Book Number, sequência numérica de dez ou treze dígitos com a finalidade de identificação numérica de um livro segundo seu título, autor, paí...
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | ISBN |
| Language | Portuguese |
| Part of speech | Abbreviation |
| Letters | 4 |
| Frequency rank | #11,899 |
| Misspellings tracked | 6 |
| Confusable pairs | 7 |
| Source | Wiktionary (kaikki.org) |
Where “ISBN” sits in Portuguese frequency
Spelling & Dictionary Insight
The Portuguese entry for ISBN is 4 letters long, classified as an abbreviation. Corpus data places it at rank #11,899 in overall Portuguese word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "sigla formada com as iniciais de International Standard Book Number, sequência numérica de dez ou treze dígitos com a finalidade de identificação numérica de um livro segundo seu título, autor, paí...".
Our generated misspelling index lists 6 likely wrong-spelling variants for ISBN, with forms such as "ibsn", "isbbn", and "isbnn". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 7 confusable-pair relationships, "isso", "isto", "in", and more, where similar look or sound leads writers to substitute one word for another in context.
No documented word history exists for this headword, so its spelling is easiest to reason about phoneme by phoneme, absent a documented history. The correct Portuguese form is ISBN, spelled I-S-B-N.
Definition
- 1sigla formada com as iniciais de International Standard Book Number, sequência numérica de dez ou treze dígitos com a finalidade de identificação numérica de um livro segundo seu título, autor, país, ou código de idioma, e a editora, individualizando inclusive edições diferentes de tal forma que cada livro tenha um número próprio e único
Common misspellings
Also misspelled as: ibsn,isbbn,isbnn,isnb,issbn,sibn
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of ISBN - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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 Portuguese corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
How do you spell "ISBN"?
What does "ISBN" mean?
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Is PlainSpell free to use?
Using “ISBN”
The practical upshot for anyone who landed here from a spell-check.
- The one correct Portuguese spelling is I-S-B-N - every other letter order is a misspelling in standard orthography.
- Don't mix it up with “isso” - see the side-by-side comparison. ISBN vs isso
- Browse more Portuguese words and confusable pairs in the same reference. Portuguese words
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.