1. 
2. 
[syn: priority, antecedence, antecedency, anteriority, precedence, precedency]
The Collaborative International Dictionary of English v.0.48:
Anteriority \An*te`ri*or"i*ty\, n. [LL. anterioritas.]
   The state of being anterior or preceding in time or in
   situation; priority. --Pope.
   [1913 Webster]
WordNet (r) 3.0 (2006):
anteriority
    n 1: the quality of being in front or (in lower animals) toward
         the head [ant: posteriority]
    2: preceding in time [syn: priority, antecedence,
       antecedency, anteriority, precedence, precedency]
       [ant: posteriority, subsequence, subsequentness]