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formula

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The definition of a formula is a group of mathematical symbols that express a relationship or that are used to solve a problem, or a way to make something.

(noun)

A group of math symbols that expresses the relationship between the circumference of a circle and its diameter is an example of a formula.
A guide for how to combine chemicals to achieve a certain reaction is an example of a formula.
A plan for how to produce a desired outcome is an example of a formula for success.

See formula in Webster's New World College Dictionary

noun pl. formulas or formulae

a fixed form of words, esp. one that has lost its original meaning or force and is now used only as a conventional or ceremonial expression: “Very truly yours” is a formula used in letters
a rule or method for doing something, esp. when conventional and used or repeated without thought: a formula for musical comedies
an exact statement of religious faith or doctrine
1. directions for preparing a medicine, a paint, a baby's food, etc.
2. something prepared from such directions; often specif., a milk preparation for feeding a baby
a set of algebraic symbols expressing a mathematical fact, principle, rule, etc.: A = πr is the formula for determining the area of a circle
Chem. an expression of the composition of a compound (or a radical, etc.) by a combination of symbols and figures to show the constituents

Origin: L, dim. of forma, form

adjective

designating or of any of various classes of racing car or motorcycle specially designed to conform to a particular set of specifications governing size, weight, engine displacement, etc.

See formula in American Heritage Dictionary 4

noun pl. for·mu·las or for·mu·lae (-lēˌ)

a. An established form of words or symbols for use in a ceremony or procedure.
b. An utterance of conventional notions or beliefs; a hackneyed expression.
A method of doing or treating something that relies on an established, uncontroversial model or approach: a new situation comedy that simply uses an old formula.
Chemistry
a. A symbolic representation of the composition or of the composition and structure of a compound.
b. The compound so represented.
a. A prescription of ingredients in fixed proportion; a recipe.
b. A liquid food for infants, containing most of the nutrients in human milk.
Mathematics A statement, especially an equation, of a fact, rule, principle, or other logical relation.
Formula Sports A set of specifications, including engine displacement, fuel capacity, and weight, that determine a class of racing car.