Longman Dictionary of Contemporary English homepage

guideline

noun
     
guideā€§line [countable usually plural]
1 rules or instructions about the best way to do something
guideline for
a new set of guidelines for teachers
guideline on
guidelines on the employment of children
draw up/issue guidelines
The hospital has issued new guidelines on the treatment of mentally ill patients.
This chapter gives you some guidelines to help you in your work.
clear/strict guidelines
Today most planning authorities enforce fairly strict guidelines on new houses.
2 something that helps you form an opinion or make a decision:
When starting a new business, try to follow these general guidelines.
within ... guidelines
Teachers can choose books within certain broad guidelines.

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