noun-modifying (irregular)
cultural; culture-oriented
Used attributively to describe things related to culture, often in contrast to science or sports. Common in compounds like 文化系クラブ (culture club) or 文化系女子 (cultured girl).
彼は文化系の部活に入っている。
He belongs to a culture-oriented club.
文化系のイベントが大学で開かれた。
A cultural event was held at the university.
Often used for academic fields (humanities), while 文化系 is broader and includes cultural activities.
Compound of 文化 (culture) and 系 (system/type). The exact historical derivation is uncertain, but it follows a common pattern for categorizing groups or fields.