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

1.
غير محدد, غير تعريفي
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.
أخي، الذي يعيش في لندن، طبيب.
•
The book, which was published last year, became a bestseller.
الكتاب، الذي نُشر العام الماضي، أصبح الأكثر مبيعًا.