guideline

guide·line

noun

The definition of a guideline is something used to define how a judgment or policy is made.

An example of a guideline is all actors trying out for a part by performing a scene made popular by a famous actor.

a standard or principle by which to make a judgment or determine a policy or course of action

noun

A statement or other indication of policy or procedure by which to determine a course of action: guidelines for the completion of tax returns.

Noun

(plural guidelines)

A non-specific rule or principle that provides direction to action or behaviour.
He considered the Ten Commandments more a guideline than a requirement.
A plan or explanation to guide one in setting standards or determining a course of action.
A light line, used in lettering, to help align the text.