1.Definition: a conceptual separation or distinction

Related Noun(s):demarcation, line

Category: General

2.Definition: the act of distinguishing by comparing differences

Category: General

3.Definition: the opposition or dissimilarity of things that are compared

"In contrast to", "By contrast"

Category: General

4.Definition: the perceptual effect of the juxtaposition of very different colors

Category: General

5.Definition: the range of optical density and tone on a photographic negative or print (or the extent to which adjacent areas on a television screen differ in brightness)

Category: General