The Collaborative International Dictionary of English v.0.48:

Subsequence \Sub"se*quence\, Subsequency \Sub"se*quen*cy\, n.
   The act or state of following; -- opposed to precedence.
   [1913 Webster]

WordNet (r) 3.0 (2006):

subsequence
    n 1: something that follows something else [syn: sequel,
         subsequence]
    2: following in time [syn: posteriority, subsequentness,
       subsequence] [ant: antecedence, antecedency,
       anteriority, precedence, precedency, priority]