subordinating conjunction
noun/səˌbɔːdɪneɪtɪŋ kənˈdʒʌŋkʃn/
/səˌbɔːrdɪneɪtɪŋ kənˈdʒʌŋkʃn/
(grammar)- a word that begins a subordinate clause, for example ‘although’ or ‘because’ compare coordinating conjunction
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subordinating conjunction