non-defining
US /ˌnɑːn dɪˈfaɪnɪŋ/
UK /ˌnɑːn dɪˈfaɪnɪŋ/

1.
비제한적인
a non-defining relative clause gives extra information about the noun or pronoun it refers to, but is not essential to the meaning of the sentence. It is usually separated by commas.
:
•
My brother, who lives in London, is a doctor.
런던에 사는 우리 형은 의사다.
•
The book, which was published last year, became a bestseller.
작년에 출판된 그 책은 베스트셀러가 되었다.