de ‧ ter ‧ min ‧ er /dɪˈtɜːmənə, dɪˈtɜːmɪnə $ -ˈtɜːrmənər/ BrE AmE noun [countable] technical
[ Word Family: adjective : ↑ determined , ↑ indeterminate , ↑ predetermined ; noun : ↑ determination , ↑ determiner ; verb : ↑ determine ; adverb : determinedly]
a word that is used before a noun in order to show which thing you mean. In the phrases ‘the car’ and ‘some cars’, ‘the’ and ‘some’ are determiners