1) Apriori 
• (adv.) By deduction; by way of inference; by consequence.
De·duct'ive·ly adverb By deduction; by way of inference; by consequence. Sir T. Browne. 
deductive, deductively 1. Based on deduction from accepted premises; such as, a deductive argument or deductive reasoning. 2. Involving or using deduction in reasoning.