'aprioristic' originates from Latin, specifically the phrase 'a priori', where 'a' meant 'from' and 'prior' meant 'earlier'. The English adjective is formed by combining 'a priori' with the adjectival suffix '-istic'.

'aprioristic' developed from the Latin philosophical phrase 'a priori' (used in scholastic and philosophical Latin), passed into modern European philosophical usage and was adapted into English as 'aprioristic' by adding the suffix '-istic'.

Initially it meant the literal sense 'from the earlier' (i.e., prior to experience), but over time it came to mean 'known or justified independently of experience; based on theoretical or deductive reasoning.'