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==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] fidelite, from Middle French & [[Latin]]; Middle French fidelité, from Latin fidelitat-, fidelitas, from fidelis [[faithful]], from fides faith, from fidere to [[trust]]
*Date: [http://www.wikipedia.org/wiki/15th_Century 15th century]
==Definitions==
*1 a : the [[quality]] or [[state]] of being faithful
:b : accuracy in details : exactness
*2 : the [[degree]] to which an electronic device (as a record player, radio, or television) accurately reproduces its [[effect]] (as [[sound]] or picture)
==Synonyms==
allegiance, fealty, [[loyalty]], [[devotion]], [[piety]] mean faithfulness to something to which one is bound by pledge or [[duty]]. fidelity implies strict and continuing faithfulness to an obligation, [[trust]], or duty <marital fidelity>. allegiance suggests an adherence like that of citizens to their country <pledging allegiance>. fealty implies a fidelity acknowledged by the individual and as compelling as a sworn vow <fealty to the [[truth]]>. [[loyalty]] implies a faithfulness that is [[steadfast]] in the face of any temptation to renounce, desert, or betray <valued the loyalty of his [[friends]]>. [[devotion]] stresses zeal and [[service]] amounting to self-dedication <a painter's [[devotion]] to her art>. piety stresses fidelity to obligations regarded as natural and fundamental <filial piety>
==Description==
'''Fidelity''' is the [[quality]] of [[being]] [[faithful]] or [[loyal]]. Its [[original]] [[meaning]] regarded [[duty]] to a lord or a king, in a broader sense than the related [[concept]] of fealty. Both derive from the [[Latin]] word fidēlis (A III adjective), meaning "faithful or loyal"
In modern [[human]] [[relationships]], the term can refer to [[sexual]] monogamy. In western [[culture]] this often means adherence to [[marriage]] vows, or of promises of exclusivity or monogamy, and an [[absence]] of adultery. However, some people do not equate fidelity in personal relationships with sexual or [[emotional]] monogamy. Often, however, [[Women|females]] in [http://en.wikipedia.org/wiki/Shakespeare Shakespeare] are associated with it in a [[negative]] sense, such as "She is with little fidelity". For example, Bertram accuses Helena of having "little fidelity" in [http://en.wikipedia.org/wiki/All%27s_Well_That_Ends_Well All's Well That Ends Well].
Fidelity also denotes how accurate a copy is to its [[source]]. For example, a worn gramophone record will have a lower fidelity than one in good condition, and a recording made by a low budget record company in the early 20th century is likely to have significantly less audio fidelity than a good modern recording. In the 1950s, the terms "high fidelity" or "hi-fi" were popularized for equipment and recordings designed for more accurate sound reproduction, while "lo-fi" music aims for "authenticity" over perfect production. Similarly in electronics, fidelity refers to the [[correspondence]] of the output signal to the input signal, rather than [[sound]].
In the fields of [[scientific]] [[modelling]] and [[simulation]], fidelity refers to the [[degree]] to which a model or simulation reproduces the [[state]] and [[behaviour]] of a real world object, feature or condition. Fidelity is therefore a measure of the realism of a model or simulation[1]. Simulation fidelity has also been described in the past as 'degree of similarity'.
The computer age has spawned the term Wi-Fi in [[reference]] to certain [[groups]] of wireless electronic devices. While the term Wi-Fi has been popularly taken to be an abbreviation of 'wireless fidelity', Wi-Fi is in fact a commercial brand owned by the Wi-Fi Alliance, and has nothing to do with fidelity as a [[concept]].
In the field of program evaluation, the term fidelity denotes how closely a set of procedures were implemented as they were supposed to have been. For example, it's difficult to draw conclusions from a [[study]] about formative assessment in school classrooms if the [[teachers]] are not able or willing to follow the procedures they received in [[training]].
[[Category: General Reference]]
==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] fidelite, from Middle French & [[Latin]]; Middle French fidelité, from Latin fidelitat-, fidelitas, from fidelis [[faithful]], from fides faith, from fidere to [[trust]]
*Date: [http://www.wikipedia.org/wiki/15th_Century 15th century]
==Definitions==
*1 a : the [[quality]] or [[state]] of being faithful
:b : accuracy in details : exactness
*2 : the [[degree]] to which an electronic device (as a record player, radio, or television) accurately reproduces its [[effect]] (as [[sound]] or picture)
==Synonyms==
allegiance, fealty, [[loyalty]], [[devotion]], [[piety]] mean faithfulness to something to which one is bound by pledge or [[duty]]. fidelity implies strict and continuing faithfulness to an obligation, [[trust]], or duty <marital fidelity>. allegiance suggests an adherence like that of citizens to their country <pledging allegiance>. fealty implies a fidelity acknowledged by the individual and as compelling as a sworn vow <fealty to the [[truth]]>. [[loyalty]] implies a faithfulness that is [[steadfast]] in the face of any temptation to renounce, desert, or betray <valued the loyalty of his [[friends]]>. [[devotion]] stresses zeal and [[service]] amounting to self-dedication <a painter's [[devotion]] to her art>. piety stresses fidelity to obligations regarded as natural and fundamental <filial piety>
==Description==
'''Fidelity''' is the [[quality]] of [[being]] [[faithful]] or [[loyal]]. Its [[original]] [[meaning]] regarded [[duty]] to a lord or a king, in a broader sense than the related [[concept]] of fealty. Both derive from the [[Latin]] word fidēlis (A III adjective), meaning "faithful or loyal"
In modern [[human]] [[relationships]], the term can refer to [[sexual]] monogamy. In western [[culture]] this often means adherence to [[marriage]] vows, or of promises of exclusivity or monogamy, and an [[absence]] of adultery. However, some people do not equate fidelity in personal relationships with sexual or [[emotional]] monogamy. Often, however, [[Women|females]] in [http://en.wikipedia.org/wiki/Shakespeare Shakespeare] are associated with it in a [[negative]] sense, such as "She is with little fidelity". For example, Bertram accuses Helena of having "little fidelity" in [http://en.wikipedia.org/wiki/All%27s_Well_That_Ends_Well All's Well That Ends Well].
Fidelity also denotes how accurate a copy is to its [[source]]. For example, a worn gramophone record will have a lower fidelity than one in good condition, and a recording made by a low budget record company in the early 20th century is likely to have significantly less audio fidelity than a good modern recording. In the 1950s, the terms "high fidelity" or "hi-fi" were popularized for equipment and recordings designed for more accurate sound reproduction, while "lo-fi" music aims for "authenticity" over perfect production. Similarly in electronics, fidelity refers to the [[correspondence]] of the output signal to the input signal, rather than [[sound]].
In the fields of [[scientific]] [[modelling]] and [[simulation]], fidelity refers to the [[degree]] to which a model or simulation reproduces the [[state]] and [[behaviour]] of a real world object, feature or condition. Fidelity is therefore a measure of the realism of a model or simulation[1]. Simulation fidelity has also been described in the past as 'degree of similarity'.
The computer age has spawned the term Wi-Fi in [[reference]] to certain [[groups]] of wireless electronic devices. While the term Wi-Fi has been popularly taken to be an abbreviation of 'wireless fidelity', Wi-Fi is in fact a commercial brand owned by the Wi-Fi Alliance, and has nothing to do with fidelity as a [[concept]].
In the field of program evaluation, the term fidelity denotes how closely a set of procedures were implemented as they were supposed to have been. For example, it's difficult to draw conclusions from a [[study]] about formative assessment in school classrooms if the [[teachers]] are not able or willing to follow the procedures they received in [[training]].
[[Category: General Reference]]