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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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538111 videos foundNext > 

Regina Spektor - "Fidelity" [Official Music Video]

2006 WMG Fidelity (Video) Regina's new album 'What We Saw from the Cheap Seats' is available now: http://smarturl.it/whatwesawitunesyt For more Regina: ...

Regina Spektor - Fidelity

Fidelity-Regina Spektor Lyrics Video (HD)

No ©copyright intended. © goes to Regina Spektor* Font: Annie Use Your Telescope dafont.com.

Regina Spektor - "Fidelity" (Live In London)

2010 WMG Fidelity (Live In London) Directed by Adria Petty for East Pleasant Pictures Regina's new album 'What We Saw from the Cheap Seats' is available ...

Jasmine Thompson (cover) - Fidelity (lyrics)

Cover by Jasmine Thompson with lyrics.

Test Fidelity in Brazil what would you do

Test Fidelity in Brazil what would you do http://www.empregodfblog.com.br.

Regina Spektor - Fidelity - Live In London [HD]

Regina Spektor perfoms Fidelity as part of her Far Tour, Live at the Hammersmith Apollo in London - December 4, 2009. Tags: Regina Spektor Fidelity Live In ...

Fidelity AMV (Best Drama and Editor's Choice - Anime Boston 2013)

Gah, this is the first full project I've made in a loooong time. I've been constantly working on things, but I always drop them.This is going to be my first of a few ...

Fidelity - Regina Spektor (Sub Español)

Letra en inglés: I never loved nobody fully Always one foot on the ground And by protecting my heart truly I got lost in the sounds I hear in my mind All of these ...

Regina Spektor - Fidelity (cover by Jasmine Thompson) +Lyrics

Fanvideo from http://www.jasmine-thompson-fanpage.net 'Fidelity' - from Jasmine's album 'Another Bundle of Tantrums' Albums: ...

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6868673 news items

Sat, 28 Nov 2015 10:56:15 -0800

With all those options to choose from, you might think there's not much else that can be done, but one Canadian company has set out to prove that there's still plenty of room for improvement in the world of wireless speakers. Mass Fidelity's first ...

Catholic News Agency

Catholic News Agency
Sat, 28 Nov 2015 09:48:45 -0800

In an off-the-cuff homily in the Jesuit tradition – brief, with three main points – Pope Francis reflected on three words: memory, fidelity and prayer. The greatest treasure of the memory of the Ugandan people is the witness of their martyrs, the Holy ...


Tue, 24 Nov 2015 19:56:15 -0800

The Hoboken, New Jersey company said on Tuesday that it raised $350 million and that it had an additional $150 million in commitments on the way. Once closed, the round, which was led by Fidelity Investments , will value Jet.com at $1.5 billion and ...

Wall Street Journal

New York Times
Fri, 20 Nov 2015 10:45:00 -0800

Fidelity is testing its own automated investing platform, which it is calling Fidelity Go. The move puts the company into head-to-head competition with so-called robo-adviser start-ups like Betterment and Wealthfront, as well as traditional players ...


Fri, 27 Nov 2015 15:37:30 -0800

Earlier this month, the company released its latest high-fidelity earbuds and while they're not available for order in the United States, VentureBeat has spent the past couple of weeks with them and here's our review. These new earbuds emerged on the ...
Mon, 23 Nov 2015 21:07:36 -0800

New York (Reuters) – Fidelity Investments is building an automated portfolio management service for individual investors, joining a growing group of money and brokers that have bought or designed such "robo advisors." The platform, called Fidelity Go, ...

Wichita Eagle

Wichita Eagle
Wed, 25 Nov 2015 11:44:07 -0800

Not long after the completion of a year-long renovation project recently at the bank's downtown headquarters, Fidelity Bank Chairman Clark Bastian witnessed his favorite customer reaction to the work. “There was a lady who came in when I was in the ...


Wall Street Journal
Mon, 23 Nov 2015 04:56:15 -0800

A new Fidelity Investments program aims to help financial advisers manage the challenges that come with aging clients, including protecting such clients from financial abuse. As part of the effort launched Monday, advisers who use Fidelity's clearing ...

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