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(noun) convention, pattern, normal, rule
something regarded as a normative example
the convention of not naming the main character; violence is the rule not the exception; his formula for impressing visitors
(noun) rule
(mathematics) a standard procedure for solving a class of mathematical problems
he determined the upper bound with Descartes' rule of signs; he gave us a general formula for attacking polynomials
(noun) expression
a group of symbols that make a mathematical statement
(noun) recipe
directions for making something
(noun) chemical formula
a representation of a substance using symbols for its constituent elements