precept

Short definition from Wiktionary

Noun

1. 1
   A rule or principle, especially one governing personal conduct.
2. 2
   A written command, especially a demand for payment.
3. 3
   An order issued by one local authority to another specifying the rate of tax to be charged on its behalf.
4. 4
   An order issued by one local authority to another specifying the rate of tax to be charged on its behalf: A rate or tax set by a precept.

Verb

1. 1
   To act as a preceptor; to teach a physician-in-training by supervising their clinical practice.
2. 2
   To teach (something) by precepts.