Source : Webster's Revised Unabridged Dictionary (1913)

Insistence \In*sist"ence\, n.
   The quality of insisting, or being urgent or pressing; the
   act of dwelling upon as of special importance; persistence;
   urgency.

Source : WordNet®

insistence
     n 1: continual and persistent demands [syn: {insisting}]
     2: the state of urgently demanding notice or attention; "the
        press of business matters" [syn: {imperativeness}, {insistency},
         {press}, {pressure}]
     3: urgently demanding attention; "the insistence of their
        hunger"; "he pressed his demand with considerable
        instancy" [syn: {imperativeness}, {insistency}, {instancy}]