Meaning of CANONICAL in English
/ kəˈnɒnɪkl; NAmE -ˈnɑːn-/ (also ca·non·ic / kəˈnɒnɪk; NAmE -ˈnɑːn-/) adjective
included in a list of holy books that are accepted as genuine; connected with works of literature that are highly respected
according to the law of the Christian Church
( technical ) in the simplest accepted form in mathematics
late Middle English : from medieval Latin canonicalis , from Latin canonicus canonical, from Greek kanonikos , from kanon rule.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005