guide·line

[gahyd-lahyn]
noun
1.
any guide or indication of a future course of action: guidelines on the government's future policy.
2.
a lightly marked line used as a guide, as in composing a drawing, a typed page, or a line of lettering.
3.
a rope or cord that serves to guide one's steps, especially over rocky terrain, through underground passages, etc.
4.
a rope or wire used in guiding the movement of stage scenery or curtains being raised or lowered.

Origin:
1775–85, Americanism; guide + line1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
guideline (ˈɡaɪdˌlaɪn) [Click for IPA pronunciation guide]
 
n
a principle put forward to set standards or determine a course of action

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Use this basic list as a guideline to consider and rank features.
Your warm and helpful guideline implies a whole lot to me and even further to
  my office colleagues.
Guideline for prevention and management of pressure ulcers.
Most of us are familiar with the food pyramid, the government's guideline for
  healthful eating.
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