a pri·o·ri (ä′ prē-ôrē, ā′ prī-ôrī)
1. Proceeding from a known or assumed cause to a necessarily related effect; deductive.
a. Derived by or designating the process of reasoning without reference to particular facts or experience.
b. Knowable without appeal to particular experience.
3. Made before or without examination; not supported by factual study.
[Medieval Latin ā priōrī : Latin ā, from + Latin priōrī, ablative of prior, former.]
a′ pri·ori adv.
a′ pri·ori·ty (-ôrĭ-tē, -ŏr-) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.