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For other uses, see Fidelity (disambiguation).
Palazzo Ducale in Venice: capital # 28 in the porch, featuring Virtues and vices - In fidelitate nulli gero (Fidelity)

Fidelity is the quality of faithfulness or loyalty. Its original meaning regarded duty in a broader sense than the related concept of fealty. Both derive from the Latin word fidēlis, meaning "faithful or loyal". In the City of London financial markets it has traditionally been used in the sense encompassed in the motto "My word is my bond".


Fidelity also denotes how accurately a copy reproduces 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 which exhibited more accurate sound reproduction. The converse term "lo-fi", does not necessarily mean "low fidelity", rather that the production ethic aims for "gritty authenticity" over perfect production. Similarly in electronics, fidelity refers to the correspondence of the output signal to the input signal, rather than sound quality, as in the popular internet connection technology "Wi-Fi".

Scientific modelling and simulation[edit]

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".[2]

Program evaluation[edit]

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 is 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.[3]


  1. ^ "SISO-REF-002-1999: Fidelity Implementation Study Group Report". Simulation Interoperability Standards Organization. 1999. Retrieved January 2, 2015. 
  2. ^ Hays, R. T.; Singer, M. J. (1989). Simulation fidelity in training system design: Bridging the gap between reality and training. Springer-Verlag. 
  3. ^ O'Donnell, Carol L. (2008). "Defining, Conceptualizing, and Measuring Fidelity of Implementation and Its Relationship to Outcomes in K–12 Curriculum Intervention Research". Review of Educational Research 78 (1): 33–84. doi:10.3102/0034654307313793. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Fidelity — Please support Wikipedia.
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655337 news items

Wall Street Journal

Wall Street Journal
Sat, 30 Apr 2016 11:33:38 -0700

Fidelity Investments reversed course in March, marking up many of the stakes in closely held technology companies it had previously cut, including a biotech startup that was subsequently acquired at a large premium. The mutual-fund company late Friday ...


Thu, 28 Apr 2016 10:37:30 -0700

Unfortunately, you wouldn't have been able to predict that by viewing Fidelity's most recent monthly valuation report, which had Stemcentrx marked down a whopping 37.75% from the time of its original investment. We don't know why Fidelity was way off, ...
Sat, 30 Apr 2016 17:56:15 -0700

The Management of Fidelity Bank Plc has re-emphasised the bank's commitment to cooperate with the authorities in respect of the investigation into transactions undertaken by the bank in the normal course of business in 2015. In a release, the bank said ...
Sat, 30 Apr 2016 19:03:45 -0700

Determined to eradicate the scourge of unemployment currently ravaging the country, Fidelity Bank Plc, one of the nation's highly diversified lender, in strategic partnership with Gazelle Academy and University of Nigeria Nsukka (UNN), has empowered ...
Road to VR
Sat, 30 Apr 2016 05:45:00 -0700

If you're interest in getting your hands on the client, head over to High Fidelity's website and sign up here. The client supports the Oculus Rift DK2 and CV1 as well as the HTC Vive in SteamVR and is available on Windows and OSX. After spending a very ...


Business Wire (press release)
Fri, 29 Apr 2016 05:22:30 -0700

For long-term savers between the ages of 35-39 – when, according to Fidelity, individuals should aim to have saved2 between two to three times their salary in retirement savings – the average balance was $131,000 at the end of Q1. More individuals are ...


Fri, 29 Apr 2016 11:00:00 -0700

The private-equity funds will be part of Fidelity's Alternative Investments Network, which the Boston-based behemoth started in 2013. The private-equity offerings are “a natural evolution of that platform,” says Gary Gallagher, senior vice president at ...


Mon, 25 Apr 2016 05:56:15 -0700

Wall Street estimates for this year's earnings growth have been coming down precipitously since January, raising the question about whether there's more of a broad-based slowdown afoot, the director of global macro research at Fidelity Investments said ...

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