Yōu xiān literally combines yōu (excellent, superior) and xiān (before, earlier), conveying the idea of something being 'superior in order' — that is, given precedence over other things. As a noun, it refers to priority or precedence: the right or status of coming before others in importance, time, or treatment.

This word appears frequently in formal, administrative, and everyday contexts — such as policy documents ('priority groups'), transportation ('priority seating'), customer service ('priority handling'), and personal planning ('family comes first' — expressed as 家庭优先). It often functions after verbs like 给予 (to give), 享有 (to enjoy), or 设定 (to set), and commonly pairs with 的 to form adjectival phrases like 优先权 (right of priority) or 优先考虑 (priority consideration).