This is the 4031st most frequent Turkish word.
fen
"Fen" in Turkish means "science."
Here, 'fen' is used as part of 'fen dersi' which means 'science class'.
Fen dersinde bugün elektrik devrelerini öğrendik.
Today in science class, we learned about electrical circuits.
In this sentence, 'fen' refers to the domain of scientific knowledge.
Onun fen bilgisi gerçekten uzman seviyesinde.
Her knowledge in science is truly at an expert level.
Here, 'fen' abbreviates a field of study within 'Fen-edebiyat fakültesi', indicating the 'science' part of the university faculty.