The adjective paradigmatic is a fancy word for describing something that is an ideal or standard. Monet's paintings are paradigmatic of impressionism — they are a typical example of that style of art.
Use paradigmatic when you're talking about things that are archetypal or representative of some category and you want to sound impressive. You'll come across it if you study the subject of linguistics, where "paradigmatic analysis" is one way of analyzing a text, by examining patterns within it. The Greek word for "pattern," paradeigma, is the root of paradigmatic.