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To prevent an initial crash, you must open the app once before using elsewhere
Some of the additional features require Xposed framework to work and would be disabled if you don't have it
TEXT XPOSED started out as a simple Xposed module to add 3 options (Define, Search and Share) to the Contextual Action Bar when some text was selected while typing.
But since it's inception, much work has gone towards further expanding the 3 areas to provide some handy utilities when you select some text almost anywhere on your Android device and most features don't require Xposed anymore
DEFINE
This feature shows you a swift little pop-up with the definition of the word you select. Ideal when you are reading an e-book or a news article and find it rather distracting to open a dictionary app again and again.