"A priori truth" refers to a statement or proposition whose truth can be ascertained without the need for empirical evidence or experience. Some synonyms for this term include "analytic truth," which refers to a statement that is true by definition or logic, and "necessary truth," which is a statement that could not possibly be false. Another synonym is "logical truth," which is a statement that is true based on the rules of logic. Other related concepts include "axioms," which are self-evident truths that are taken as the basis for logical arguments, and "deduction," which is the process of reasoning from a set of axioms to logically derive new truths".