precept (noun) - a rule or principle, especially one governing personal conduct; a commandment [pree-sept]
BREAKDOWN: PRE (before) + CEPT- (grasp)
preceptive means instructive or didactic in nature; mandatory; relating to a rule or principle
a preceptor is a teacher, tutor, or head of a school
a preceptorial is a college course, individualized clinical experience, or independent study
See also: inception
“There is no moral precept that does not have something inconvenient about it.” —Denis Diderot