precedence
noun [ U ] uk/ˈpres.ɪ.dəns/ us/ˈpres.ə.dens/
（时间、顺序、重要程度等的）居前，领先
the condition of being dealt with before other things or of being considered more important than other things
Precedence must be given to the injured in the evacuation plans. 在疏散计划中应优先考虑伤者。
Business people often think that fluency and communication take precedence over grammar when speaking. 商界人士常认为说话时流利程度和表达能力比语法重要。
formal地位先后，级别高低
the order of importance given to people in particular societies, groups, or organizations
The order of precedence for titled nobility in Britain is duke, marquis, earl, viscount, baron. 在英国有爵位的贵族级别依次为公爵、侯爵、伯爵、子爵和男爵。