4102  pistis  pis'-tis

 from 3982; persuasion, i.e. 
credence; moral conviction 
(of religious truth, or the 
truthfulness of God or a 
religious teacher), 
especially reliance upon 
Christ for salvation; 
abstractly, constancy in such 
profession; by extension, the 
system of religious (Gospel) 
truth itself:--assurance, 
belief, believe, faith, 
fidelity.

 see GREEK for 3982