contrast in WordNet English dictionary

1. the act of distinguishing by comparing differences
   contrast 
   
2. 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)
   contrast 
   
3. the perceptual effect of the juxtaposition of very different colors
   contrast 
   
4. a conceptual separation or distinction
   "there is a narrow line between sanity and insanity"
   line  dividing line  demarcation  contrast 
   
5. the opposition or dissimilarity of things that are compared
   "in contrast to", "by contrast"
   contrast  direct contrast 
   

1. put in opposition to show or emphasize differences
   "The middle school teacher contrasted her best student's work with that of her weakest student"
   contrast 
   
2. to show differences when compared; be different
   "the students contrast considerably in their artistic abilities"
   contrast  counterpoint