Political Parties Act Article 3

In this Act, the term “political parties” refers to a group of citizens of the Republic of China who share a common political ideology, safeguard the free and democratic constitutional order, help shape the political will of the people, and nominate candidates for election to public office.
中文原文 政黨法第3條
本法所稱政黨,指由中華民國國民組成,以共同政治理念,維護自由民主憲政秩序,協助形成國民政治意志,推薦候選人參加公職人員選舉之團體。

English translation for reference only; the Chinese text prevails. Not legal advice.