Noun
1. directions prescribed beforehand; the action of prescribing authoritative rules or directions;
"I tried to follow her prescription for success"2. a drug that is available only with written instructions from a doctor or dentist to a pharmacist;
"he told the doctor that he had been taking his prescription regularly"3. written instructions for an optician on the lenses for a given person
4. written instructions from a physician or dentist to a druggist concerning the form and dosage of a drug to be issued to a given patient