IPA: /məˈtrɪkjʊlənt/
KK: /məˈtrɪk.jʊ.lənt/
A person who has enrolled or is registered as a student at a college or university.
As a new matriculant, she was excited to start her classes next week.
Matriculant is formed from "matricula" (from Latin, meaning a register or list) and "-ant" (a suffix used to form agent nouns). The word refers to a person who is registered or enrolled, particularly in an educational institution.
Think of a 'register' ('matricula') where students are 'enrolled' ('-ant') — that's why a matriculant is someone who is registered in a school.