IPA: /nɒnˈmætrɪkjʊleɪtɪd/
KK: /nɑnˈmætrɪkjʊleɪtɪd/
Describing someone who is not officially enrolled in a school or university program.
She took a few classes as a nonmatriculated student before deciding to apply for a degree.
Nonmatriculated → It is formed from "non-" (meaning not) and "matriculatus" (from Latin "matriculare", meaning to enroll or register). The word describes someone who is not enrolled or registered in a course or institution.
Think of 'not' ('non-') being combined with 'enrolled' ('matriculatus') — this helps you remember that nonmatriculated means someone who is not enrolled.