1
a
: an authoritative rule
especially
: a rule for conduct of a liturgical service
c
: an explanatory or introductory commentary : gloss
specifically
: an editorial interpolation
2
: a heading of a part of a book or manuscript done or underlined in a color (such as red) different from the rest
3
: an established rule, tradition, or custom
4
: a guide listing specific criteria for grading or scoring academic papers, projects, or tests
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Merriam-Webster unabridged
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