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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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Thu, 18 Dec 2014 04:00:00 -0800

While about three-quarters of RIA firms consider marketing and business development to be a priority, only about one-third actually has a plan in place, says David Canter, executive vice president and head of practice management and consulting for ...

Boston Globe

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Thu, 04 Dec 2014 20:31:12 -0800

She is the heiress without airs, the billionaire who breaks type. Abigail Johnson, newly installed as chief executive of Fidelity Investments, is known to fly commercial when it's more convenient and to sometimes cool her heels at the car rental ...


Tue, 02 Dec 2014 11:57:40 -0800

The second-largest custodian to registered investment advisers, Fidelity said Tuesday it will begin offering financial advisers access to LearnVest, an online advice platform that employs human advisers. The move comes less than two months after ...


Mon, 15 Dec 2014 07:52:25 -0800

With over $1,740.6 billion of mutual fund assets under management (as of Sep 30, 2014) and a wide variety of mutual funds spanning across a wide spectrum of sectors, Fidelity Investments is one of the largest mutual fund companies in the world.
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best of 2014 2015 185 The 5 Best Fidelity Funds for 2015 Heading into a new year after as many record highs in the S&P 500 as has ever been the case, investors are rightly nervous about whether valuations here are too sky-high. At the same time, the ...

Crave Online

Crave Online
Fri, 19 Dec 2014 09:48:45 -0800

Maxed out, I had just enough horsepower to experience Metal Gear Solid at its greatest fidelity ever, while also remaining at 60 frames per second for my entire stealth playthrough. While some of this is due to the sheer horsepower of my setup, a lot ...
Mon, 15 Dec 2014 08:52:30 -0800

Myers, 39, will step back from overseeing the Fidelity Advisor Small Cap Value Fund and Fidelity Small Cap Value Fund. He will continue to manage the $6 billion Fidelity Small Cap Discovery Fund, which mostly invests in the growth or value stocks of ...

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