Определение non restrictive в Английский Язык Английский Язык словарь
a non-restrictive relative clause gives additional information about a particular person or thing rather than saying which person or thing is being mentioned. For example, in the sentence 'Perry, who is 22, was arrested yesterday', the phrase 'who is 22' is a non-restrictive clause
not limiting the reference of a modified word or phrase; "the nonrestrictive clause in `I always buy his books, which have influenced me greatly,' refers to his books generally and adds an additional fact about them