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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 being faithful or loyal. 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".


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 which exhibited more accurate sound reproduction. The converse term "lo-fi", doesn't 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'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.[3]


  1. ^ "SISO-REF-002-1999: Fidelity Implementation Study Group Report". 
  2. ^ Hays, R.; Singer, M. (1989). Simulation fidelity in training system design: Bridging the gap between reality and training. Springer-Verlag. 
  3. ^ O’Donnell, Carol (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. Retrieved March 6, 2010. 

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26858 news items

Thu, 18 Sep 2014 04:15:00 -0700

At Fidelity we serve millions of women investors, giving us unique perspectives on how women save and plan. Through conversations with clients and their families, here's what we've learned: Women are, in fact, making more money, but too few of them are ...


Fri, 19 Sep 2014 10:48:45 -0700

"High-fidelity sound quality is truly a natural evolution of the market," says Andy Chen, chief executive of Tidal, a Norwegian service set to expand to the U.S. "Music is probably the only entertainment-content format in which people have accepted ...
Fri, 19 Sep 2014 03:18:45 -0700

Expert views: Should you buy Fidelity Multi Asset Income and what are the alternatives? Fund experts said the fund has a good track record beating the majority of similar funds that have less than 35pc of their money in shares. But Philippa Gee of ...
Thu, 18 Sep 2014 14:37:35 -0700

BOSTON, Sep 18, 2014 (BUSINESS WIRE) -- Fidelity Investments® announced today that the Fidelity® Nasdaq Composite Index® Tracking Stock Fund ONEQ, +0.66% will pay a quarterly dividend of $0.36 per share from net investment income. The dividend ...
Fri, 19 Sep 2014 09:18:45 -0700

Brent Beckman has been named a business lending manager at Fidelity. In his new job, Beckman will help manage the bank's loan portfolio and guide efforts to expand its commercial banking business in Wichita and Kansas City, Fidelity said in a news ...
Insurance News Net
Fri, 19 Sep 2014 08:22:30 -0700

19, 2014 /PRNewswire/ -- Fidelity Southern Corporation ("Fidelity") (NASDAQ: LION), holding company for Fidelity Bank (the "Bank), announced the completion of the previously announced acquisition of the deposits of six branches of CenterState Bank of ...
The Jersey Journal - NJ.com
Fri, 19 Sep 2014 11:00:00 -0700

More than 100 employees from Fidelity Investments helped transform a Jersey City school both inside and out last week. Volunteers from the Downtown Jersey City firm engaged students at Rafael De J. Cordero School 37 in Jersey City in games based on ...
Sun, 14 Sep 2014 16:26:15 -0700

About a third of gold production is probably money-losing when the price of the metal is lower than $1,250 an ounce, said Joe Wickwire, who manages more than $1.8 billion of assets including the Fidelity Select Gold Portfolio. With gold trading at ...

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