WordWeb Online

1. A light line that is used in lettering to help align the letters
    
2. A detailed plan or explanation to guide you in setting standards or determining a course of action
   "the president said he had a guideline for normalizing relations with Vietnam";
   - road map
    
3. A rule or principle that provides guidance to appropriate behaviour
   - guidepost, rule of thumb

Derived forms: guidelines

Type of: counsel, counseling [US], counselling [Brit, Cdn], direction, guidance, line, plan, program, programme [Brit, Cdn], regulation, rule

Encyclopedia: Guideline