denoting a relative clause that is not restrictive
Compare restrictive (sense 2)
English Easy Learning GrammarRelative clausesRelative clauses tell us more about nouns. They function rather like adjectives, andare found as postmodifiers in a noun phrase. The noun that is modified ... Read more
nonrestrictive in American English
(ˌnɑnrɪˈstrɪktɪv)
adjective
1.
not restrictive
2. Grammar
designating a modifier, as a word, phrase, or subordinate clause, that does not limit the reference of the word or phrase it modifies but merely adds information and thus is not essential to the meaning of a sentence
it is set off by punctuation marks
“who is six feet tall” in “John, who is six feet tall, is younger than Bill” is anonrestrictive clause