Open English Wordnet
Nouns
(n)formulaa conventionalized statement expressing some fundamental principle (n)convention, normal, pattern, rule, formulasomething 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” (n)formulaa liquid food for infants (n)rule, formula(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”