an·te·ced·ence /-ˈsidṇ(t)s/
  先行;先在;逆行
  An·te·ced·ence n.
  1. The act or state of going before in time; precedence.
  2. Astron. An apparent motion of a planet toward the west; retrogradation.
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  antecedence
       n : preceding in time [syn: priority, antecedency, anteriority,
            precedence, precedency] [ant: posteriority]