Definition of “formula” - Learner’s Dictionary

formula

noun [ C ] uk us /ˈfɔːmjələ/ (plural formulas, formulae)
METHOD

a plan or method that is used to achieve something:

There's no magic formula for success.
RULE

a set of letters, numbers, or symbols that are used to express a mathematical or scientific rule

LIST

a list of the substances that something is made of

(Definition of “formula” from the Cambridge Learner's Dictionary © Cambridge University Press)