1A political party — an organization of people united around shared policies or ideology.
新しい政党が次の選挙に候補者を立てると発表した。
A new political party announced it will field candidates in the next election.
彼は党の代表に選ばれた。
He was chosen as the party's leader.
与党と野党の間で予算をめぐる議論が続いている。
Debate over the budget continues between the ruling party and the opposition.
2Used as a suffix to mean a person who is especially fond of something, or an enthusiast of a category (e.g. 甘党 'sweet tooth').
彼は甘党で、食後には必ずデザートを食べる。
He has a sweet tooth and always eats dessert after meals.
父は辛党で、料理には必ず唐辛子をかける。
My father loves spicy food and always adds chili pepper to his dishes.