1. Pertaining to something or someone that gives directives: The correct forms of grammar usage are set by prescriptive rules that children in school must learn!
2. Relating to a long-standing custom or usage: Some older teachers at school had the prescriptive advantage of having their own desks for working during their free periods.
3. Referring to the establishment of laws or rules: Many important prescriptive regulations have been made by the government during the Coronavirus pandemic in order to protect as many people as possible.