noun, noun which may take the genitive case particle 'no'
high school graduate; having a high school diploma
Colloquial abbreviation of 高等学校卒業（者）. Used to describe a person whose highest education is high school, or the status of having graduated from high school. Often appears in contexts like job requirements or educational background.
This job requires at least a high school diploma.
彼は高卒で、すぐに働き始めた。
He is a high school graduate and started working right away.
He got a job right after graduating from high school.
My father's highest level of education is a high school diploma.
The application requirement is a high school diploma or higher.