This is the 6232nd most frequent French word.
formula
A fixed, conventional method or set of principles.
Here, 'formule' refers to a specific phrasing or expression used in formal communication.
La formule de politesse est essentielle dans une lettre officielle.
The polite formula is essential in an official letter.
In this sentence, 'formule' denotes a symbolic representation in science or chemistry.
La formule chimique de l'eau est H2O.
The chemical formula for water is H2O.
Here, 'formule' is used to mean a strategy or recipe for achieving something.