Fidelity is the quality of being faithful or loyal. Its original meaning regarded duty to a lord or a king, in a broader sense than the related concept of fealty. Both derive from the Latin word fid─ôlis, meaning "faithful or loyal".

In modern human relationships, the term can refer to sexual monogamy. In western culture this often means adherence to marriage vows, or of promises of exclusivity or monogamy, and an absence of adultery. However, some people do not equate fidelity in personal relationships with sexual or emotional monogamy. (For example, see polyamory and Open marriage.) Often, however, females in Shakespeare are associated with it in a negative sense, such as "She is with little fidelity". For example, Bertram accuses Helena of having "little fidelity" in All's Well That Ends Well.

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.

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. Simulation fidelity has also been described in the past as "degree of similarity".

The computer age has spawned the term Wi-Fi in reference to certain groups of wireless electronic devices. While the term "Wi-Fi" has erroneously been taken to be an abbreviation of "wireless fidelity", Wi-Fi is in fact a commercial brand owned by the Wi-Fi Alliance, and has nothing to do with fidelity as a concept.

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.

Other articles related to "fidelity":

Fidelity Special Values
... Fidelity Special Values (LSE FSV) is a large British investment trust dedicated to special situation investments ... The fund is managed by Fidelity Worldwide Investment ...
Convoy ON 154 - HMS Fidelity 29/30 December
... Fidelity restarted main engines at 0500 and declined the offer to dispatch a tug from Gibraltar ... U-615 found Fidelity while her main engines were again stopped for repairs between 1015 and 1100 ... U-615 identified Fidelity as a Q-ship and shadowed her cautiously ...
Liquid Fidelity - Comparison To DLP Technology
... While Liquid Fidelity creates an HDTV image by controlling the amount of light reflecting from it, DLP creates an HDTV image by varying the percentage of the time that its mirrors are aimed toward the ... The main advantage of Liquid Fidelity over DLP is that the 1080p Liquid Fidelity chip has over 2 million cells, in an array of 1920 x 1080, for true ... dedicated cell for every pixel, Liquid Fidelity technology provides a sharp, stable picture with smooth, fine texture ...
Liquid Fidelity
... Liquid Fidelity is a "microdisplay" technology applied in high-definition televisions ... Components of Liquid Fidelity technology were originally used in 720p HDTVs produced by Uneed Systems of Korea from 2004-2006 ...