1. not limiting or narrowing the meaning of a word or phrase; providing additional information that is not essential to identify the noun it modifies
Usage: grammar term; also called 'nondefining' or 'appositive' clause in some contexts
2. not serving to restrict or limit; allowing freedom or broad scope
Usage: general usage

Examples

• In the sentence 'My sister, who lives in Boston, is a doctor,' the clause 'who lives in Boston' is nonrestrictive because it adds extra information.
• The nonrestrictive clause is set off by commas and could be removed without changing the core meaning of the sentence.
• A nonrestrictive relative clause provides background information rather than identifying which person or thing you mean.
• The company adopted a nonrestrictive policy on remote work, allowing employees flexibility.
• Unlike a restrictive clause, a nonrestrictive clause does not narrow down which noun is being discussed.