a priori

phrase

The verdict

“a priori” is outside the top-ranked Portuguese vocabulary, used as a phrase - the kind of word writers most often double-check.

Unranked
below top-frequency Portuguese
8
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - segundo um princípio anterior, admitido como evidente

Key facts for a priori
PropertyValue
Headworda priori
LanguagePortuguese
Part of speechPhrase
Letters8
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “a priori” sits in Portuguese frequency

a priori falls outside the top-100,000 ranked Portuguese words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The Portuguese entry for a priori is 8 letters long, classified as a phrase. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "segundo um princípio anterior, admitido como evidente".

Zero misspellings are on record for a priori in our index, typically a sign the spelling maps closely to how the word sounds. This headword has no recorded confusable partner, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

No borrowing history is documented for this entry, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct Portuguese form is a priori, spelled A- -P-R-I-O-R-I.

Definition

  1. 1
    segundo um princípio anterior, admitido como evidente

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "a priori"?
"a priori" is spelled A- -P-R-I-O-R-I.
What does "a priori" mean?
As a phrase, "a priori" means: segundo um princípio anterior, admitido como evidente
What language does "a priori" come from?
"a priori" is a Portuguese word. PlainSpell's reference spans five languages -- English, Spanish, Portuguese, French, and German -- with definitions, pronunciations, and spelling data for each.
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.

Using “a priori”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct Portuguese spelling is A- -P-R-I-O-R-I - every other letter order is a misspelling in standard orthography.
  • 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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list