IPA: /ˈkɒlɪdʒər/
KK: /ˈkɒlɪdʒər/
A person who is a member of a college, which is an educational institution for higher learning.
As a collegian, she participated in various campus activities and clubs.
Colleger is derived from the word "college" (from Latin "collēgium", meaning a group of people living together or a society) and the suffix "-er" (meaning a person who). Thus, a "colleger" refers to a person who is part of a college or a member of a college community.
Think of a 'college' as a group of people living together, and the '-er' indicates a person. So, a collegger is simply someone who belongs to that group.