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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". 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. 

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8474667 news items

IEEE Spectrum

IEEE Spectrum
Tue, 27 Jan 2015 08:03:47 -0800

The mega investment in SpaceX will give Google and Fidelity ownership of about 10 percent of the spaceflight company, according to a SpaceX press release on 20 Jan. A Wall Street Journal report cited a person close to the deal as saying the investment ...

Boston Herald

Boston Herald
Sun, 25 Jan 2015 21:08:49 -0800

Fidelity Investments is looking into more privately owned tech companies to get a leg up on investments as large, successful companies are staying private longer, according to a top investor with Fidelity. “There are companies that are exciting ...


Wed, 21 Jan 2015 12:00:34 -0800

Google is an innovative company that's throwing billions of dollars at everything from drones and satellites to wearable tech, driverless cars and contact lenses that measure glucose levels in tears. Fidelity? It runs a boatload of mutual funds that ...

New York Times

New York Times
Mon, 12 Jan 2015 14:43:24 -0800

Since I'm a Fidelity customer, I fired up Stocks Nearby to see what a hyperlocal investing strategy might mean for me. According to the app, the closest publicly traded investment opportunity to my home in New York is Scores Holding Company, which owns ...
Wed, 28 Jan 2015 00:18:15 -0800

(Bloomberg) -- Mel Watt's efforts to transfer more of the risks on mortgages guaranteed by Fannie Mae and Freddie Mac from U.S. taxpayers to investors is running into resistance from some of the biggest bond buyers such as Fidelity Investments. Watt ...
Wed, 28 Jan 2015 14:18:45 -0800

In the latest look at stocks ordered by largest market capitalization, Russell 3000 component Fidelity National Financial Inc (Symbol: FNF) was identified as having a larger market cap than the smaller end of the S&P 500, for example Waters Corp ...

Wall Street Journal

Wall Street Journal
Tue, 20 Jan 2015 15:13:41 -0800

Space Exploration Technologies Corp. said it has raised $1 billion from two new investors, Google Inc. and Fidelity Investments, in a move aimed at supporting space transportation and satellite manufacturing. Google and Fidelity will collectively own ...

Corporate Crime Reporter

Tue, 20 Jan 2015 11:52:30 -0800

From January 2006 to September 2013, Fidelity inappropriately charged for certain transactions in fee-based accounts in its Institutional Wealth Services group, which provides trading and brokerage services to investment advisers and their clients ...

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