Secondary is a term that refers to something that is of lesser importance or comes after something else. There are several synonyms for the word secondary, including subordinate, tangential, auxiliary, incidental, supplementary, and additional. The term subordinate refers to something that is of a lower rank or position than something else. Tangential means something that is only slightly related or connected to the main topic. Auxiliary is used to describe something that provides support or assistance to the main thing. Incidental refers to something that is unimportant, and supplementary means something that is added or given a complementary role. Finally, additional denotes something that is added on beyond the primary thing.