From logic rather than experience

• Based on theoretical deduction only
• From theoretical deduction

Wikipedia Word definitions in Wikipedia
An a priori language (from Latin a priori , "from the former") is any constructed language of which all or a number of features are not based on existing languages, but rather invented or elaborated as to work in a different way or to allude different purposes. ...

WordNet Word definitions in WordNet
adj: involving deductive reasoning from a general principle to a necessary effect; not supported by fact; "an a priori judgment" [ant: a posteriori ] based on hypothesis or theory rather than experiment adv : derived by logic, without observed facts [ant: ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1710, "from cause to effect" (a logical term, in reference to reasoning), Latin, literally "from what comes first," from priori , ablative of prior "first" (see prior (adj.)). Used loosely for "in accordance with previous knowledge" (1834).

Wiktionary Word definitions in Wiktionary
a. 1 (context logic English) Based on hypothesis rather than experiment. 2 self-evident, intuitively obvious 3 presumed without analysis 4 (context linguistics of a constructed language English) Developed entirely from scratch, without deriving it from ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Regulative \Reg"u*la*tive\ (r?g"?*l?*t?v), a. Tending to regulate; regulating. --Whewell. (Metaph.) Necessarily assumed by the mind as fundamental to all other knowledge; furnishing fundamental principles; as, the regulative principles, or principles a ...