the practice of putting a particular domain name (=name used as part of an Internet address) on the official list of domain names, but then not using it in an Internet address until some time in the future. This is done in order to stop the domain name being used by anyone else.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
Dictionary pictures of the day
Do you know what each of these is called?
Click on any of the pictures above to find out what it is called.