Definition of juxtapositions:
(n) :
The nearness of objects with little or no delimiter.
(n) :
The extra emphasis given to a comparison when the contrasted objects are close together.
(n) :
(art) Two or more contrasting sounds, colours, styles etc. placed together for stylistic effect.
(n) :
(rhetoric) The close placement of two ideas to imply a link that may not exist.
(n) :
(grammar) An absence of linking elements in a group of words that are listed together.
(n) :
(mathematics) An absence of operators in an expression.