Stipulative definition
Encyclopedia
A stipulative definition is a type of definition
Definition
A definition is a passage that explains the meaning of a term , or a type of thing. The term to be defined is the definiendum. A term may have many different senses or meanings...

 in which a new or currently-existing term is given a specific meaning for the purposes of argument or discussion in a given context. When the term already exists, this definition may, but does not necessarily, contradict the dictionary
Dictionary
A dictionary is a collection of words in one or more specific languages, often listed alphabetically, with usage information, definitions, etymologies, phonetics, pronunciations, and other information; or a book of words in one language with their equivalents in another, also known as a lexicon...

 (lexical
Lexical definition
The lexical definition of a term, also known as the dictionary definition, is the meaning of the term in common usage. As its other name implies, this is the sort of definition one is likely to find in the dictionary...

) definition of the term. Because of this, a stipulative definition cannot be "correct" or "incorrect"; it can only differ from other definitions, but it can be useful for its intended purpose.

For example, in the riddle of induction
Inductive reasoning
Inductive reasoning, also known as induction or inductive logic, is a kind of reasoning that constructs or evaluates propositions that are abstractions of observations. It is commonly construed as a form of reasoning that makes generalizations based on individual instances...

 by Nelson Goodman
Nelson Goodman
Henry Nelson Goodman was an American philosopher, known for his work on counterfactuals, mereology, the problem of induction, irrealism and aesthetics.-Career:...

, "grue
Grue (color)
Grue and bleen are artificial predicates, coined as two portmanteaux of "green" and "blue" by philosopher Nelson Goodman in his book Fact, Fiction, and Forecast...

" was stipulated to be "a property of an object that makes it appear green if observed before some future time t, and blue if observed afterward." "Grue" has no meaning in standard English; therefore, Goodman created the new term and gave it a stipulative definition.

Overview

Stipulative definitions of existing terms are useful in making theoretical arguments, or stating specific cases. For example:
Suppose we say that to love someone is to be willing to die for that person.
Take "human" to mean any member of the species Homo sapiens.
For the purposes of argument, we will define a "student" to be "a person under 18 enrolled in a local school."


Some of these are also precising definition
Precising definition
A precising definition is a definition that extends the lexical definition of a term for a specific purpose by including additional criteria that narrow down the set of things meeting the definition....

s, a subtype of stipulative definition that may not contradict but only extend the lexical definition
Lexical definition
The lexical definition of a term, also known as the dictionary definition, is the meaning of the term in common usage. As its other name implies, this is the sort of definition one is likely to find in the dictionary...

 of a term. Theoretical definition
Theoretical definition
A theoretical definition gives the meaning of a word in terms of the theories of a specific discipline. This type of definition assumes both knowledge and acceptance of the theories that it depends on. To theoretically define is to create a hypothetical construct...

s, used extensively in science and philosophy, are similar in some ways to stipulative definitions (although theoretical definitions are somewhat normative -more like persuasive definitions).

Many holders of controversial and highly-charged opinions use stipulative definitions in order to attach the emotional or other connotation
Connotation
A connotation is a commonly understood subjective cultural or emotional association that some word or phrase carries, in addition to the word's or phrase's explicit or literal meaning, which is its denotation....

s of a word to the meaning they would like to give it; for example, defining "murder" as "the killing of any living thing for any reason." The other side of such an argument is likely to use a different stipulative definition for the same term: "the premeditated killing of a human being." The lexical definition in such a case is likely to fall somewhere in between.

When a stipulative definition is confused with a lexical definition there is a risk of equivocation
Equivocation
Equivocation is classified as both a formal and informal logical fallacy. It is the misleading use of a term with more than one meaning or sense...

.

The word "quark
Quark
A quark is an elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. Due to a phenomenon known as color confinement, quarks are never directly...

" is a definiendum where the definiens was stipulated by Gell-Mann.
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