Adjective meaning elementary or relating to first principles
(pertaining adjective) - Memidex dictionary/thesaurus [PAR] (pertaining adjective) definition: of, pertaining to, or characteristic of elementary 
school ... elementary | elemental [sense-specific] | simple [synonym, sense-
specific] ... not difficult; simple; rudimentary | of or concerned with the first 
principles of a... [DOC] [TLE] First principle - Wikipedia [PAR] A first principle is a basic, foundational, self-evident proposition or assumption 
that cannot be ... to the reasoning process and the latter are "posterior" meaning 
deduced or inferred in the reasoning process.