Juxtaposition- Adjective

Juxtaposition Definition- The act of placing two things side by side to create a comparison between the two.

Location of the Definition: http://www.merriam-webster.com/dictionary/juxtaposition

I encountered this word when being given the assignment of city limits in class that is due the 20th of October. The way I understand the word Juxtaposition is when I think about the poor and the rich when placing both side by side they contrast each other really well and show off the differences in their lifestyles.