[syn: insistence, insistency]
The Collaborative International Dictionary of English v.0.48:
insistency \insistency\ n.
   the state of urgently demanding notice or attention;
   insistence.
   Syn: imperativeness, insistence, press, pressure.
        [WordNet 1.5]
   2. the quality of not being ignorable.
   Syn: imperativeness, insistence.
        [WordNet 1.5 +PJC]
WordNet (r) 3.0 (2006):
insistency
    n 1: the state of demanding notice or attention; "the insistence
         of their hunger"; "the press of business matters" [syn:
         imperativeness, insistence, insistency, press,
         pressure]
    2: the act of insisting on something; "insistence on grammatical
       correctness is a conservative position" [syn: insistence,
       insistency]