Other forms: insistences
Insistence is when someone persists in forcefully asking for or requiring something. A parent's insistence might be the only reason an unmotivated teenager sits down and does his homework.
A store manager's insistence on selling things for the lowest prices might be the thing that keeps customers coming back, and your insistence on reading your speech first in class might get you to the front of the line. When you insist on something, you demand it — both words come from the Latin insistere, "persist, dwell upon, or stand upon," from in-, "upon," and sistere, "take a stand."