ISBN

Spelling & Dictionary Insight

The Portuguese entry for ISBN is 4 letters long, classified as anabbrev. 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 Hunspell-derived misspelling index lists 6 documented wrong-spelling variants for ISBN, with forms such as "ibsn", "isbbn", and "isbnn". Each variant represents a distinct typo pattern that appears often enough in corpora to be worth flagging, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution.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 explicit etymology string is stored for this entry, so spelling patterns must be inferred from the word's phoneme-to-grapheme mapping rather than from a documented borrowing chain. For readers arriving here from a spelling check, the authoritative guidance is: the correct Portuguese form is ISBN, spelled I-S-B-N, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.