GNU Collaborative International Dictionary of English

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Found one definition

1.       
   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]