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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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289243 news items


Thu, 23 Oct 2014 05:34:15 -0700

By the end of September Fidelity Charitable donors had made 271 grants totaling $875,000 towards the fight against Ebola. By the third week of October, the total of grants to fight ebola nearly doubled to over 500 and the total dollars climbed to $3.8 ...

Boston Globe

Boston Globe
Wed, 22 Oct 2014 21:58:46 -0700

As reported by the Globe's Christopher Rowland, Boston-based Fidelity Investments was able to water down new rules proposed by the Securities and Exchange Commission that were aimed at regulating the mutual fund industry in the aftermath of the 2008 ...


Wed, 22 Oct 2014 12:18:45 -0700

Steve Wymer, who runs the $41 billion Fidelity Growth Company Fund disclosed reducing his stake in Herbalife in a third-quarter commentary letter released this week. Wymer's fund is a long-time investor in Herbalife, counting it as a top 10 holding in ...

Boston Globe

Boston Globe
Sat, 18 Oct 2014 21:29:14 -0700

WASHINGTON — Abigail P. Johnson, the billionaire president and CEO of Fidelity Investments, epitomizes the quiet, old-money side of the Boston mutual fund world. With her understated, publicity-shy manner, messy Washington politics would not seem to ...
Thu, 23 Oct 2014 07:48:45 -0700

Fidelity Investment's biotechnology fund has been paring its position in Biogen Idec Inc. (BIIB), after the stock hit an all-time high earlier this year on momentum from its multiple sclerosis treatment Tecfidera. The $9.2 billion Fidelity Select ...

New York Times

New York Times
Wed, 15 Oct 2014 06:08:40 -0700

Fidelity Investments appears not to be taking offense. It announced Wednesday that it would team up with Betterment and encourage Fidelity-affiliated financial advisers to use its service. The move follows a revelation this week that a firm affiliated ...

FT Adviser

Bidness ETC
Thu, 23 Oct 2014 04:26:15 -0700

One of Fidelity Investments star stock managers cut back on his stake in Herbalife during the third quarter on allegations from activist investor Bill Ackman regarding the legality of the company's business model and the earnings miss last quarter.


Mon, 13 Oct 2014 12:22:43 -0700

Long thought to be the heir-apparent of asset management giant Fidelity, Abigail Johnson is replacing her father, Edward “Ned” Johnson III, as the company's CEO. “Abby Johnson has agreed to become Chief Executive Officer of Fidelity, reflecting a ...

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