non-frat1
/nɒnˈfrat/US College slang
noun
A college student who is not a member of a fraternity.
adjective
Of a college student or alumnus: not a member of a college fraternity.
Origin
Early 20th century. From non- + frat.
non-frat2
/nɒnˈfrat/Military slang. Now rare
noun
= non-fraternization.
Origin
1940s; earliest use found in The Manchester Guardian. Shortened from non-fraternization.