What is the meaning of rubric?

noun

• An authoritative rule of conduct or procedure.
• An explanation or definition of an obscure word in a text.
  • synonyms: gloss
• Directions for the conduct of Christian church services (often printed in red in a prayer book. )
• A heading that names a statute or legislative bill; may give a brief summary of the matters it deals with.
  • usage: "Title 8 provided federal help for schools"
  • synonyms: title, statute title
• A title or heading that is printed in red or in a special type.
• Category name.
  • usage: "it is usually discussed under the rubric of `functional obesity'"

verb

• Adorn with ruby red color. .