"guideline" in the noun sense
1. guideline
a light line that is used in lettering to help align the letters
2. road map, guideline
a detailed plan or explanation to guide you in setting standards or determining a course of action
"the president said he had a road map for normalizing relations with Vietnam"
3. guidepost, guideline, rule of thumb
a rule or principle that provides guidance to appropriate behavior
Source: WordNet® (An amazing lexical database of English)
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