( formal ) taking the argument or situation one stage further :
The blame lies with the teachers and, by extension, with the Education Service.
( formal ) taking the argument or situation one stage further :
The blame lies with the teachers and, by extension, with the Education Service.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005