AskDefine | Define fidelity

Dictionary Definition



1 accuracy with which an electronic system reproduces the sound or image of its input signal
2 the quality of being faithful [syn: faithfulness] [ant: infidelity, infidelity]

User Contributed Dictionary



fidélité ← fidelitas ← fidelis ← fides.


  1. faithfulness to one's duties
  2. accuracy, or exact correspondence to some given quality or fact
  3. loyalty, especially to one's spouse
  4. the degree to which a system accurately reproduces an input.


faithfulness to one's duties
accuracy, or exact correspondence to some given quality or fact
loyalty, especially to one's spouse
the degree to which an electronic system accurately reproduces a given sound or image

Extensive Definition

Fidelity is a notion that at its most abstract level implies a truthful connection to a source or sources. Its original meaning dealt with loyalty and attentiveness to one's duty to a lord or a king, in a broader sense than the related concept of fealty. Both derive from the Latin word fidelitas, meaning "faithfulness."
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.)
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 designed for more accurate sound reproduction, while "lo-fi" music aims for "authenticity" over perfect production. Similarly in electronics, fidelity refers to the correspondence of the output signal to the input signal, rather than sound.
The computer age has spawned the term Wi-Fi in reference to certain groups of wireless electronic devices. While the term Wi-Fi has been popularly taken to be an abbreviation of 'wireless fidelity', Wi-Fi is in fact a commercial brand owned by the Wi-Fi Alliance, and has little to do with fidelity as a concept.
fidelity in German: Treue
fidelity in Dutch: Trouw (ethiek)
fidelity in Portuguese: Fidelidade

Synonyms, Antonyms and Related Words

abandon, absoluteness, accuracy, adherence, adhesion, allegiance, application, ardency, ardor, assiduity, assiduousness, attachment, attention to fact, bona fides, bond, bonne foi, bulldog tenacity, care for truth, commitment, committedness, concentration, constancy, correctness, dedication, delicacy, dependability, devotedness, devotion, devoutness, diligence, dogged perseverance, doggedness, earnestness, endurance, engrossment, exactitude, exactness, faith, faithfulness, faultlessness, fealty, fervency, fervidness, fervor, fineness, fire, firmness, flawlessness, good faith, heartiness, heat, heatedness, homage, impassionedness, indefatigability, industriousness, industry, insistence, insistency, intensity, intentness, literalism, literality, literalness, loyalty, mathematical precision, meticulousness, niceness, nicety, obstinacy, passion, passionateness, patience, patience of Job, perfection, permanence, perseverance, persistence, persistency, pertinaciousness, pertinacity, piety, plodding, plugging, preciseness, precision, preoccupation, refinement, relentlessness, reliability, resolution, right, rightness, rigidity, rigor, rigorousness, sedulity, sedulousness, seriousness, severity, sincerity, single-mindedness, singleness of purpose, slogging, spirit, stability, stamina, staunchness, staying power, steadfastness, steadiness, stick-to-itiveness, strictness, stubbornness, subtlety, tenaciousness, tenacity, textualism, the letter, tie, tirelessness, troth, true blue, trueness, trustworthiness, unremittingness, unswerving attention, vehemence, warmth, zeal
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