IPA: //ˌpoʊstˈsɛk.ənˌdɛr.i//
KK: /ˈpoʊstˌsɛkəndˌɛri/
Relating to education that takes place after high school, such as college or university.
Many students choose to pursue postsecondary education to improve their job prospects.
Postsecondary → It is formed from "post-" (meaning after) and "secondary" (from Latin "secundarius", meaning second). The word "postsecondary" refers to education that occurs after secondary school, or high school, indicating a level of education that follows the second stage of schooling.
Think of 'after' ('post-') high school education, which is what 'postsecondary' refers to.