postsecondary
adjective
post·sec·ond·ary
ˌpōst-ˈse-kən-ˌder-ē
: of, relating to, or being education following secondary school
postsecondary education
The country has a rich infrastructure of 4,500 public and private postsecondary institutions with a high regard for academic freedom.—Lee Lawrence
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Merriam-Webster unabridged
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