Registrant (noun)

1. A person or entity that is registered or recorded in a particular database or system.
2. A person who has enrolled or signed up for a particular event, program, or service.
3. A person who has registered a domain name or trademark.

Origin:

The word 'registrant' is derived from the verb 'register', which means 'to record in writing or electronically'. the word is used in a variety of contexts to describe a person or entity that is registered or recorded in a particular database or system.

Examples:

1. The registrant list for the conference contained over 1,000 names.
2. The registrant was required to provide personal information in order to participate in the program.
3. The registrant was responsible for keeping their information up-to-date in the database.
4. The registrant was pleased with the services provided and recommended them to others.
5. The registrant was asked to confirm their information before the registration was processed.