noun
party membership; party register
Refers to being registered as a member of a political party. Often used in phrases like 党籍を持つ (to hold party membership) or 党籍を離れる (to leave a party).
彼は長年、自民党の党籍を持っている。
He has held membership in the Liberal Democratic Party for many years.
党籍を離れて無所属で立候補した。
He left the party and ran as an independent.