noun.
A lack of exactness; something inexact or imprecise
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the quality of being inaccurate and having errors
Word Usage
"Nothing endures, nothing is precise and certain (except the mind of a pedant), perfection is the mere repudiation of that ineluctable marginal inexactitude which is the mysterious inmost quality of Being."