This Notification Center Widget allows you to define words right from your NC!
DefiNeC is compatible with every iOS 7 device (iPhones, iPads, iPods)!
There´s a sample on YouTube below
Configure options from Settings.
***** Please enable DefiNeC in
the settings first after the installation! *****
You may need to download the corresponding dictionary for your language by first try to define a word then select organize (bottom left) and tap the cloud icon to download a dictionary.
Notification Center addons must first be enabled from the Settings app, in the Notifications panel