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a. A class or category: "This mission is sometimes discussed under the rubric of 'horizontal escalation' ... from conventional to nuclear war" (Jack Beatty).
b. A title; a name.
2. A part of a manuscript or book, such as a title, heading, or initial letter, that appears in decorative red lettering or is otherwise distinguished from the rest of the text.
3. A title or heading of a statute or chapter in a code of law.
4. Ecclesiastical A direction in a missal, hymnal, or other liturgical book.
5. An authoritative rule or direction.
6. A short commentary or explanation covering a broad subject.
7. Red ocher.
1. Red or reddish.
2. Written in red.
[Middle English rubrike, heading, title, from Old French rubrique, from Latin rubrīca, red chalk , from ruber, rubr-, red; see reudh- in Indo-European roots.]
ru•bri•cal(ˈru brɪ kəl)
of, contained in, or prescribed by rubrics, esp. liturgical rubrics.