1. 领先：precedence 优先 | precedency 领先 | precedent 先例
2. 上席：precedable 可能被超越 | precedency 上席 | precedented 有先例
3. 居先/上席/优越：precedence /优先/ | precedency /居先/上席/优越/ | precedent /先例/前例/惯例/判例/前的/例/
noun
1. the act of preceding in time or order or rank (as in a ceremony)
Synonym: precession precedence
2. preceding in time
Synonym: priority antecedence antecedency anteriority precedence
3. status established in order of importance or urgency
e.g. ...its precedence as the world's leading manufacturer of pharmaceuticals
national independence takes priority over class struggle
Synonym: precedence priority