prescriptive

[pri-skrip-tiv]
adjective
1.
that prescribes; giving directions or injunctions: a prescriptive letter from an anxious father.
2.
depending on or arising from effective legal prescription, as a right or title established by a long unchallenged tenure.

Origin:
1740–50; prescript + -ive, modeled on descriptive, etc.

prescriptively, adverb
prescriptiveness, noun
nonprescriptive, adjective
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World English Dictionary
prescriptive (prɪˈskrɪptɪv)
 
adj
1.  making or giving directions, rules, or injunctions
2.  sanctioned by long-standing usage or custom
3.  derived from or based upon legal prescription: a prescriptive title
 
pre'scriptively
 
adv
 
pre'scriptiveness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Hacker accepts the distinction linguists make between prescriptive and
  descriptive grammar.
In the common shorthand, linguistics is descriptive, not prescriptive.
Moreover, the results are prescriptive with respect to when and how such
  strategies should be used.
At the time the bill was described as enabling rather than prescriptive.
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