Prescriptive means laying down how things ought to be done. Prescriptive rules, too prescriptive, prescriptive grammar.
It is the opposite of descriptive, and the argument between them runs through the whole study of language. Used of a policy it is usually a complaint that no room has been left for judgement.
1adjectiveprescriptiveLaying down how things ought to be done.
“The guidance is prescriptive down to the size of the lettering.”
prescriptive is a quality.
Latin praescriptivus comes from praescribere, to write beforehand, from prae plus scribere, to write.
Latin
praescriptivus — relating to a legal exception
English, today
prescriptive
Built from
From Latin praescriptivus (“relating to a legal exception”), from praescript- (“directed in writing”), from the verb praescribere.
Etymology from Wiktionary, CC BY-SA