Nomen

die Kollegin

Translation

female colleague, female coworker

Meine Kollegin ist sehr nett.

My (female) colleague is very nice.

Ich arbeite mit einer Kollegin zusammen.

I work together with a (female) colleague.

((Nominative)) as a subject Meine Kollegin kommt aus Spanien.

((Dative)) as an indirect object Ich helfe meiner Kollegin.

((Accusative)) as a direct object Ich frage meine Kollegin.

Mitarbeiterin (female employee), Kommilitonin (female fellow student)

From Latin 'collega' (colleague). The German suffix '-in' denotes a female person.

Think of 'co-league' - someone in the same professional league as you. The '-in' ending is a key marker for feminine nouns in German.