registration
n. C / Un. the act of signing up or putting your name on an official list. It can also mean the document or number that proves you have done this.
n. the act of enrolling or recording a name in an official register; also refers to the documentation or identification mark resulting from this process.
The registration for the new course starts tomorrow.
You must complete your vehicle registration before you are legally allowed to drive on public roads.
The conference organisers streamlined the registration process by allowing attendees to upload their credentials and pay fees through a secure mobile application.
From register + -ation.
Uncountable when referring to the general process of enrolling; countable when referring to a specific instance or a physical document.
I made my registration for the classI completed my registration for the classLearners often use 'make' with registration, but 'complete', 'finish', or 'carry out' are more natural collocations.