AXIOM Meaning of AXIOM in English noun 1.Synonyms: principle 1, fundamental, law, principium, theorem 2.Synonyms: maxim , aphorism, apothegm, brocard, dictum, gnome, moral, rule, truism Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003