noun |
adj |
verb |
adv |

**(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