1. to remove from a register or official list; to cancel or revoke a registration
Users can unregister from the mailing list at any time.
Os usuários podem descadastrar da lista de e-mails a qualquer momento.
2. in computing, to remove a software component from system registry
You need to unregister the DLL file before deleting it.
Você precisa descadastrar o arquivo DLL antes de deletá-lo.
3. to stop being registered or enrolled in a program or service
I decided to unregister from the online course.
Decidi descadastrar do curso online.