how can i uninstall my purchased application in itune store

Howdy nanisharma14,

To uninstall an app that was installed from the Mac App Store on your Mac, open Launchpad and hold down on the icon until all the icons start to jiggle. At that point you will see a delete button (x) for any apps that can be uninstalled. Click on it. If an app does not have a delete button, it can not be uninstalled.

See this article for reference - Mac App Store: Buy, download, and install apps

Thanks for using Apple Support Communities.

Best to you.