pre·ce·dence /ˈprɛsədən(t)s, prɪˈsidṇ(t)s/
  領先,在先,優先,優先權
  precedence
  優先權; 優先次序
  precedence
  在先 居先 優先法
  Pre·ced·ence Pre·ced·en·cy n.
  1. The act or state of preceding or going before in order of time; priority; as, one event has precedence of another.
  2. The act or state of going or being before in rank or dignity, or the place of honor; right to a more honorable place; superior rank; as, barons have precedence of commoners.
     Which of them [the different desires] has the precedency in determining the will to the next action?   --Locke.
  Syn: -- Antecedence; priority; preëminence; preference; superiority.
  ◄ ►
  precedence
       n 1: status established in order of importance or urgency;
            "...its precedence as the world's leading manufacturer
            of pharmaceuticals"; "national independence takes
            priority over class struggle" [syn: precedency, priority]
       2: preceding in time [syn: priority, antecedence, antecedency,
           anteriority, precedency] [ant: posteriority]
       3: the act of preceding in time or order or rank (as in a
          ceremony) [syn: precession, precedency]