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a priori

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adjective a pri·o·ri \ˌä-prē-ˈȯr-ē, ˌa-; ˌā-(ˌ)prī-ˈȯr-ˌī, -ˌprē-ˈȯr-ē\

Simple Definition of a priori

  • : relating to what can be known through an understanding of how certain things work rather than by observation

Full Definition of a priori

  1. 1 a :  deductive b :  relating to or derived by reasoning from self-evident propositions — compare a posteriori c :  presupposed by experience

  2. 2 a :  being without examination or analysis :  presumptive b :  formed or conceived beforehand

a priori adverb
apri·or·i·typlay \-ˈȯr-ə-tē\ noun

Examples of a priori

  1. There's no a priori reason to think your expenses will remain the same in a new city.

  2. <an a priori argument for the defendant's innocence>



Origin of a priori

Latin, literally, from the former


First Known Use: 1652



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