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== What are definitions in the ''Citizendium?'' == The ''Citizendium'' uses definitions in two different places. The first, discussed in [[CZ:Article_Mechanics#Definitions|Article Mechanics]], are in articles, typically stated in the first sentence. The second, which we discuss here, are created using [[CZ:subpages|subpages]] of the form <nowiki>[[Term/Definition]]</nowiki>. The latter are "definition subpages." Definition pages actually serve as ''reusable'' building-blocks which provide a ''brief'' (no more than 30 word/150 character) account of the meaning of a concept, or a pithy description of a particular topic. '''Note:''' please create definitions only of those precise terms for which we have or plan an article. Do not create definitions of terms that are [[CZ:Disambiguation|disambiguated]]. For example, the page [[reel]] redirects to [[reel (disambiguation)]], where three senses of the term are listed and each separately defined. But we do not, and should not, have a definition of "reel" itself. <!-- Instead, the page [[Reel/Definition]] should contain the entry <nowiki>{{dabdef|Reel}}</nowiki> which calls a template that displays the following message: :{{dabdef|Reel}} --> == Purpose == Definitions pages are used primarily on [[CZ:Related Articles|Related Articles]] pages; the latter consist of lists of term-definition pairs. When exploring the ''Citizendium''<nowiki></nowiki>'s article offerings on Related Articles pages, we believe end users will find it useful to have definitions, especially of unfamiliar terms. Definition pages are used elsewhere as well, however. == Format standards == It is easy to locate a definition for a given term, if it exists. If an article is titled [[Topic]], then you may find the definition at [[Topic/Definition]]. But you really do not need to know this; the correct subpage name is created by the "Definition" link in the subpage tab, as well as the {{Tl|r}} template (see [[CZ:Related Articles|Related Articles]] and [[Template:R/Doc]] for more information). === Format of the definition itself === Only a few remarks are necessary about the format of the definition. In the following, suppose just for the sake of illustration that "knowledge" is defined as "Justified, true belief." * Limit your definition to 100 characters (ignoring formatting like <nowiki>[[]] and ''''</nowiki>). Ten words or fewer is adequate in many cases. * Do not repeat the term defined. So, do ''not'' write: "'''Knowledge''' is justified, true belief." Write: "Justified, true belief." * Begin the definition with a capital letter, and end with a period. So, do not write "justified, true belief" (lower case "j" and without a period). Write: "Justified, true belief." * If you must use two sentences, divide them by a semicolon, not a period. * Do not leave any extra blank lines after the definition. The contents will be very short. * Do not add categories, images, templates, or other bells and whistles to the definition page. The definition page must be reusable in, potentially, many different contexts, so it should be as stripped-down as possible. === How to display a definition === ====Def template==== You may easily display a definition by using the {{tl|Def}} template. For example: <code><nowiki>"{{Def|Biology}}"</nowiki></code> produces: "{{Def|Biology}}" If used on an entry that does not have a definition (e.g. [[Foobar]]), <code><nowiki>"{{Def|Foobar}}"</nowiki></code> produces: "{{Def|Foobar}}" If no definition for the term exists, create one by clicking on the "Add definition" link and type in your definition. ====R template==== The {{tl|R}} template (most often used on the subpage [[CZ:Related Articles|Related Articles]]) is also useful for displaying the definition or description in conjunction with the word used in the template. For example: <code><nowiki>{{R|Biology}}</nowiki></code> produces: {{R|Biology}} If used on an entry that does not have a definition (e.g. [[Foobar]]), <code><nowiki>{{R|Foobar}}</nowiki></code> produces: {{R|Foobar}} For more information on how to use the R template read the documentation at [[Template:R/Doc]]. == Guidelines for editing == Definitions are often created in the context of Related Articles pages; see [[CZ:Related Articles|our guidelines for creating such pages]] to get started. See [[#Format standards|above]] for guidelines about the "physical" format of the definition. Some general hints: * Choose a term to define that precisely matches an existing or planned article. Do not choose terms that will be disambiguated, such as [[reel]]. * Do not describe the article; define the concept, or describe the thing, that the article describes. * Avoid jargon wherever possible; a definition's purpose is supposed to be useful to people who don't already know the meaning of the word defined. You defeat this purpose if you use even more obscure jargon to explain a piece of jargon. When you are ready to craft a definition, examine whether the term to be defined is general and so describes many things (like "book"), or particular and so describes just one thing (like ''The Grapes of Wrath''). Then consider the standards for definitions and for descriptions below. === Standards for good definitions === If the term is general, it is subject to definition (rather than description). In most cases, a classic genus-and-difference definition would work fine. Here are some rules taken from a standard logic text for such definitions: * Rule 1: A definition should state the essential attributes of the concept (i.e., of the thing defined). * Rule 2: A definition must not be circular. * Rule 3: A definition must be neither too broad nor too narrow. * Rule 4: A definition must not be expressed in ambiguous, obscure, or figurative language. * Rule 5: A definition should not be negative where it can be affirmative. === Standards for good descriptions === Strictly speaking, it is impossible to ''define'' the names of particular persons, places, and things, like "Paris, France." Instead we say that we make pithy ''descriptions'' of these things. Here are some guidelines: * For famous persons and landmarks, include what the item is best known for: "Madonna (singer): Pop music icon of the 1980s, known especially for her sexy/trashy image." * For persons, provide dates of birth and death in parentheses: "Amelia Earhardt: (1897-1937) Famous American female aviation pioneer." * For places, specify an encompassing geographical entity or a nearby landmark, and if that is generally obscure, also provide the name of an encompassing entity that is probably familiar: "Wiesbaden: Capital of the state of Hesse, Germany; pop. about 275,000." {{Content Policy}}

• Biology/Definition
• Foobar/Definition
• Template:!
• Template:Biology/Metadata
• Template:Community
• Template:Content Policy
• Template:Def
• Template:Foobar/Metadata
• Template:H:title
• Template:R
• Template:R style2
• Template:Rpl def1
• Template:Rpl def3
• Template:Rpl style3
• Template:Tl
• Template:Tln
• Template:X0

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