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guideline

[gahyd-lahyn] /ˈgaɪdˌlaɪn/
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 of guideline
1775-1785
1775-85, Americanism; guide + line1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for guideline

guideline

/ˈɡaɪdˌlaɪn/
noun
1.
a principle put forward to set standards or determine a course of action
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for guideline
n.

1785, "line marked on a surface before cutting," from guide + line (n.). Meaning "rope for steering a hot-air balloon" is from 1846. In figurative use by 1948. Related: Guidelines.

Online Etymology Dictionary, © 2010 Douglas Harper
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