formula

noun8

1. •
   a rule about numbers that is written in signs and letters rather than in words

   • x=(-b±√)/(2a) is a formula for finding the roots of the quadratic equation ax² + bx + c = 0.
2. •
   A symbolic expression of the structure of a compound.

   • H₂O is the formula for water.
3. •
   A syntactic expression of a proposition, built up from quantifiers, logical connectives, variables, relation and operation symbols, and, depending on the type of logic, possibly other operators such as modal, temporal, deontic or epistemic ones.
4. •
   A formulation; a prescription; a mixture or solution made in a prescribed manner; the identity and quantities of ingredients of such a mixture.

   • The formula of the rocket fuel has not been revealed.
5. •
   Ellipsis of infant formula, drink given to babies to substitute for mother's milk.

   • They tried switching formulas, and it seemed to work: the baby seemed more content while feeding.
6. •
   A plan or method for dealing with a problem or for achieving a result.

   • The company's winning formula includes excellent service and quality products.
7. •
   A fixed phrase or set of words intended to be interpreted non-literally, typically used attitudinally or as part of convention; a formulation.

   • Avoid the typical epistolic formalae, such as "Kind regards".
8. •
   A formal statement of doctrine.