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Wordnet 3.0

ADJECTIVE (2)

1. involving deductive reasoning from a general principle to a necessary effect; not supported by fact;
- Example: "an a priori judgment"

2. based on hypothesis or theory rather than experiment;


ADVERB (1)

1. derived by logic, without observed facts;


The Collaborative International Dictionary of English v.0.48:

Regulative \Reg"u*la*tive\ (r?g"?*l?*t?v), a. 1. Tending to regulate; regulating. --Whewell. [1913 Webster] 2. (Metaph.) Necessarily assumed by the mind as fundamental to all other knowledge; furnishing fundamental principles; as, the regulative principles, or principles a priori; the regulative faculty. --Sir W. Hamilton. [1913 Webster] Note: These terms are borrowed from Kant, and suggest the thought, allowed by Kant, that possibly these principles are only true for the human mind, the operations and belief of which they regulate. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

A priori \A` pri*o"ri\ [L. a (ab) + prior former.] 1. (Logic) Characterizing that kind of reasoning which deduces consequences from definitions formed, or principles assumed, or which infers effects from causes previously known; deductive or deductively. The reverse of a posteriori. [1913 Webster] 3. (Philos.) Applied to knowledge and conceptions assumed, or presupposed, as prior to experience, in order to make experience rational or possible. [1913 Webster] A priori, that is, from these necessities of the mind or forms of thinking, which, though first revealed to us by experience, must yet have pre["e]xisted in order to make experience possible. --Coleridge. [1913 Webster]
WordNet (r) 3.0 (2006):

a priori adv 1: derived by logic, without observed facts [ant: a posteriori] adj 1: involving deductive reasoning from a general principle to a necessary effect; not supported by fact; "an a priori judgment" [ant: a posteriori] 2: based on hypothesis or theory rather than experiment
Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "a priori": a fortiori, a posteriori, analytic, back, backward, categorical, conditional, deducible, deductive, derivable, dialectic, discursive, dogmatic, early, enthymematic, epagogic, ex post facto, hypothetical, inductive, inferential, into the past, maieutic, reasoned, retroactive, retrospective, soritical, syllogistic, synthetic