1. 预选：primary colors 红 | primary election 预选 | primary meeting 预选会

2. 预选; 初选：primary education 初等教育 | primary election 预选; 初选 | primary key 主钥匙, 用于基本搜寻分类的钥匙 (计算机用语)

noun

1. a preliminary election where delegates or nominees are chosen

Synonym: primary