canonEnglishOxford American Thesauruscanon noun 1 the appointment violated the canons of fair play and equal opportunity: principle, rule, law, tenet, precept, formula; standard, convention, norm, pattern, model, exemplar; criterion, measure, yardstick, benchmark, test. 2 a set of ecclesiastical canons: law, decree, edict, statute, dictate, dictum, ordinance; rule, ruling, regulation; in the Roman Catholic Church decretal. 3 the Shakespeare canon: (list of) works, writings, oeuvre.