A-priori meaning

ä prē-ôrē, ā prī-ôrī
From what is before. Deductive reasoning or the ascertaining of truth by proceeding from an assumption to its logical conclusion rather than by actual experience or observation. For example, one who walks by a store when its alarm is sounding and sees that its window is broken can deduce that a burglary has occurred without having watched the burglars commit the actual crime.
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Proceeding from a known or assumed cause to a necessarily related effect; deductive.
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Made before or without examination; not supported by factual study.
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From cause to effect or from a generalization to particular instances; deductive or deductively.
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Based on theory, logic, fixed rules or forms, etc. instead of on experience or experiment.
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Before examination or analysis.
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(law) Known ahead of time.
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(logic) Based on hypothesis rather than experiment.

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

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(linguistics, of a constructed language) Developed entirely from scratch, without deriving it from existing languages.
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(logic) In a way based on theoretical deduction rather than empirical observation.
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Origin of a-priori

  • L, lit., from what precedes < a, ab, from + priori, abl. of prior: see prior

    From Webster's New World College Dictionary, 5th Edition

  • Medieval Latin ā priōrī Latin ā from Latin priōrī ablative of prior former

    From American Heritage Dictionary of the English Language, 5th Edition

  • First attested in 1710, from Latin a priori (“former”), literally from the former.

    From Wiktionary