the GNU version of the Collaborative International Dictionary of English
adj. not sharing a common point; -- of lines, planes, or surfaces.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. (of lines, planes, or surfaces) never meeting or crossing
Word Usage
"In our house, genetics rears its twisty DNA head in the differences between my two boys, who could easily be described in terms of nonintersecting circles in a Venn diagram, the nonintersection being the important part."