a priori

UK/ˌɑː pɹiˈɔːɹi/UK/ˌeɪ pɹaɪˈɔːɹaɪ/US/ˌɑ pɹiˈoɹi/US/ˌæ pɹiˈoɹi/

adjective

Self-evident, intuitively obvious.

“In his opening argument, the student mentioned nothing beyond his a priori knowledge.”

Similar
deductivedeductively[Appendix:Glossarytheoreticaltheoretic

Meanings

adjectivea priori (comparative more a priori, superlative most a priori)

comparative more a priori · superlative most a priori · alternative apriori

  1. human sciencesBased on hypothesis and theory rather than experiment or empirical evidence.

    In his opening argument, the student mentioned nothing beyond his a priori knowledge.

    1 more example

    While the great critics drew their authority from the breadth of their reading, New Criterion critics often base their authority on an a priori rejection of the contemporary.

    1996, Jeet Heer, Gravitas, Autumn 1996
  2. human sciencesDeveloped entirely from scratch, without deriving it from existing languages.
    1 more example

    Conlangers can also create a priori languages, which have no basis in existing languages. You might be familiar with more a priori conlangs than you think: The Klingon language from the television series “Star Trek,” the Na’vi language from the movie “Avatar,” and the Dothraki language from the television series “Game of Thrones” are all examples of a priori languages.

    2012 November 1, Laura Wright, “UT Language Creation Society invites students to learn origins of newer languages”, in The Daily Texan, archived from the original on 26 Feb 2013
adverba priori (comparative more a priori, superlative most a priori)

comparative more a priori · superlative most a priori · alternative apriori

  1. human sciencesIn a way based on theoretical deduction rather than empirical observation.

    Synonyms: deductively[Appendix:Glossary · Antonyms: a posteriori, inductively

Synonyms & antonyms

adverbIn a way based on theoretical deduction rather than empirical observation.

Similar
deductively[Appendix:Glossary
Similar
Opposite

More synonyms by meaning

adjectiveinvolving deductive reasoning from a general principle to a necessary effect; not supported by fact

Opposite

adjectivebased on hypothesis or theory rather than experiment

adverbderived by logic, without observed facts

Opposite

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Medieval Latinā priōrī“involving reasoning from cause to effect; from first principles”
  2. Englisha priori

First attested in 1610. Learned borrowing from Medieval Latin ā priōrī (“involving reasoning from cause to effect; from first principles”, literally “from the former”).

Full word history & related roots →

Translations

Arabic مُسَلَّم بِه, لَا يُحْتَاجُ إِثْبَاتَة إِلَى تَجْرِبَة
  • مُسَلَّم بِه (musallam bih)logic: based on hypothesis rather than experiment
  • لَا يُحْتَاجُ إِثْبَاتَة إِلَى تَجْرِبَةlogic: based on hypothesis rather than experiment
  • مُسَبَّق (musabbaq)derived by logic
Chinese Mandarin 先驗 /先验, 先驗 /先验
  • 先驗 /先验 (xiānyàn)logic: based on hypothesis rather than experiment
  • 先驗 /先验 (xiānyàn)derived by logic
Czech a priori
  • a prioriderived by logic
Danish a priori
  • a priorilogic: based on hypothesis rather than experiment
Dutch a priori
  • a prioriderived by logic
Finnish itsestäänselvä, itsestään selvä
  • itsestäänselväself-evident, intuitively obvious
  • itsestään selväself-evident, intuitively obvious
  • oletusarvoinenself-evident, intuitively obvious
  • lähtökohtainenpresumed without analysis
  • oletusarvoinenpresumed without analysis
  • apriorinenpresumed without analysis
  • apriorinenlogic: based on hypothesis rather than experiment
  • hypoteettinenlogic: based on hypothesis rather than experiment
  • fiktiivinenlinguistics: developed entirely from scratch
  • apriorisestiderived by logic
  • a prioriderived by logic
French a priori
  • a prioriderived by logic
German a priori
  • a prioriderived by logic
Greek επαγωγικός, συμπερασματικός
  • επαγωγικός (epagogikós)logic: based on hypothesis rather than experiment
  • συμπερασματικός (symperasmatikós)logic: based on hypothesis rather than experiment
  • εκ των προτέρων (ek ton protéron)derived by logic
Hebrew אפריורי
  • אפריורי (apriori)derived by logic
Hindi प्रागनुभविक, अनुभवनिरपेक्ष
  • प्रागनुभविक (prāgnubhvik)logic: based on hypothesis rather than experiment
  • अनुभवनिरपेक्ष (anubhvanirpekṣ)logic: based on hypothesis rather than experiment
  • पूर्वसिद्ध (pūrvasiddh)derived by logic
Italian a priori, teorico
  • a priorilogic: based on hypothesis rather than experiment
  • teoricologic: based on hypothesis rather than experiment
  • preconcettologic: based on hypothesis rather than experiment
  • a prioriderived by logic
Japanese 先験的, アプリオリ
  • 先験的 (senkenteki)logic: based on hypothesis rather than experiment
  • アプリオリ (apuriori)logic: based on hypothesis rather than experiment
  • アプリオリ (apuriori)derived by logic
Korean 선험적인
  • 선험적인 (seonheomjeogin)logic: based on hypothesis rather than experiment
Norwegian Bokmål a priori, a priori
  • a priorilogic: based on hypothesis rather than experiment
  • a prioriderived by logic
Polish a priori, a priori
  • a prioriself-evident, intuitively obvious
  • a prioripresumed without analysis
  • a priorilogic: based on hypothesis rather than experiment
  • apriorycznylogic: based on hypothesis rather than experiment
  • apriorystycznylogic: based on hypothesis rather than experiment
  • a priorilinguistics: developed entirely from scratch
  • a prioriderived by logic
  • aprioryczniederived by logic
Portuguese a priori, a priori
  • a priorilogic: based on hypothesis rather than experiment
  • a prioriderived by logic
Romanian a priori
  • a prioriderived by logic
Russian априо́рный, доо́пытный
  • априо́рный (apriórnyj)logic: based on hypothesis rather than experiment
  • доо́пытный (doópytnyj)logic: based on hypothesis rather than experiment
  • предположи́тельный (predpoložítelʹnyj)logic: based on hypothesis rather than experiment
  • априо́ри (aprióri)derived by logic
  • зара́нее (zaráneje)derived by logic
  • незави́симо от о́пыта (nezavísimo ot ópyta)derived by logic
  • до о́пыта (do ópyta)derived by logic
Spanish a priori, a priori
  • a prioriself-evident, intuitively obvious
  • a prioripresumed without analysis
  • a priorilogic: based on hypothesis rather than experiment
  • a priorilinguistics: developed entirely from scratch
  • a prioriderived by logic
Tagalog matwiranin
  • matwiraninlogic: based on hypothesis rather than experiment
Turkish apriori, önsel
  • apriorilogic: based on hypothesis rather than experiment
  • önsellogic: based on hypothesis rather than experiment
  • önselderived by logic
Ukrainian апріо́рний, апріо́рі
  • апріо́рний (apriórnyj)logic: based on hypothesis rather than experiment
  • апріо́рі (aprióri)derived by logic
Vietnamese tiên nghiệm
  • tiên nghiệmlogic: based on hypothesis rather than experiment

Rhymes & wordplay

Rhymes with a priori

All rhymes →
Cite this entry
APA

a priori. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/a%20priori

MLA

“a priori.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/a%20priori. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “a priori,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/a%20priori.

Source: a priori on Wiktionary, CC BY-SA 4.0.