apriority 1. From a general law to a particular instance; valid independently of observation. 2. Existing in the mind prior to and independent of experience, as a faculty or character trait. 3. Not based on prior study or examination; nonanalytic: 'He made an a priori judgment.' The term a posteriori has the opposite meaning: from particular inst... Found on http://www.wordinfo.info/words/index/info/view_unit/3782/