guideline

guideline is on the Academic Word List.

Noun

(countable) A guideline is a formal suggestion about how something should be done, but it is not a rule.
If you are a new driver you should try to follow these basic safety guidelines.

Our new guidelines will also say that we must be careful treat everyone equally.

The general guidelines for healthy eating stay the same.
(countable) A guideline is a line on a page that helps you see where to write or how to draw something.
(countable) A guideline is a rope or string that shows you where to go.