Definition of fidelity in English:



mass noun
  • 1Faithfulness to a person, cause, or belief, demonstrated by continuing loyalty and support.

    ‘his fidelity to liberal ideals’
    • ‘The various obligations of a fiduciary merely reflect different aspects of his core duties of loyalty and fidelity.’
    • ‘To demonstrate fidelity to the deceased family member, a band of wind and percussion instruments is often present to perform both traditional and popular music.’
    • ‘Respect and kindness, fidelity and sincerity, are no doubt the essential points which Judo students should particularly observe.’
    • ‘A covenant is more binding because it is not predicated on interest, but instead on loyalty, fidelity and holding together.’
    • ‘I suppose my own lingering belief in some fidelity to the subject at hand as a mandate for teachers has always caused me to worry about overpersonalizing what I teach.’
    • ‘Muldoon's fidelity to his beliefs was considerable, but came to be compromised.’
    • ‘His political enemies cannot fault his character; the worst they can say is that his integrity and notorious fidelity are boring.’
    • ‘Adult females may simply show a higher degree of fidelity to specific areas than males when they come ashore to fast during the open water season.’
    • ‘Of the four, he is the most faithful to the values they share, but it's his very loyalty and fidelity that ultimately doom him.’
    • ‘The Democrat Party, which had hitherto taken the notion of a ‘loyal opposition’ to extremes of patriotic fidelity, has also now broken ranks with a battered White House.’
    • ‘Three types of territoriality were recognized according to the defense rate and degree of fidelity to the foraging site.’
    • ‘Females demonstrate strong fidelity to the sites where they hatched, and they lead their mates back to those sites in the spring.’
    • ‘Mary, a devout Catholic, did little to impose her faith on Scotland, but had little support for this fidelity.’
    • ‘Instead, any impulse for transparent dialogue is ritually displaced into domestic disputes about matters such as fidelity to the nation state during times of conflict.’
    • ‘The George circle was close and intimate and his disciples vowed to perpetuate his memory by remaining faithful to his precepts of service, heroic values and fidelity to the ideal of the true Germany.’
    • ‘Yet literal-mindedness is not honesty or fidelity to truth - far from it.’
    • ‘First, there is an implied term that the employee will serve the employer with loyalty and fidelity.’
    • ‘It survived and prospered thanks to the generosity and fidelity of thousands of volunteers who knew that if the young people were strong Ireland would be strong.’
    • ‘The children may also feel that they themselves are demonstrating a lack of fidelity by supporting their remarrying parent.’
    • ‘Both male and female adult polar bears captured in Manitoba and Ontario showed a high degree of fidelity over time to locations on shore.’
    loyalty, allegiance, obedience, constancy, fealty, homage
    View synonyms
    1. 1.1 Sexual faithfulness to a spouse or partner.
      • ‘She loved him, even though he was incapable of loyalty and fidelity and yet what choice did she have but to love him?’
      • ‘Signals of fidelity and sexual restraint will be of value in a long-term partner, as this will help to increase a male's confidence of paternity in invested offspring.’
      • ‘One area in which men and women differ is the importance of their partner's sexual fidelity.’
      • ‘Sexual fidelity and honoring one's word (whether this involves a vow of marriage or a commitment to celibacy) go to the heart of who we are.’
      • ‘Of course, sexual intimacy and fidelity between the sexes can be frustrating and exhausting, and particularly in a society which is increasingly predicated on other values.’
      • ‘The aspect of marriage that strikes me as most relevant to homosexual couples (especially men) is the promise of sexual fidelity.’
      • ‘Sexual fidelity, marriage, contraception, the Bible, all good.’
      • ‘People's attitudes to sexual fidelity vary widely.’
      • ‘Children whose parents are split asunder by adultery have their assumptions about trust, fidelity and commitment greatly damaged.’
      • ‘The problem I have with the presumption - as distinct from the conscious, informed choice - of sexual fidelity is that I think it closes off one way of learning.’
      • ‘In fact, the history of AIDS in Uganda supports the Church's belief that abstinence and fidelity within marriage are actually the best ways to fight AIDS.’
      • ‘Generally, a husband and wife owe one another duties of mutual respect, fidelity and support.’
      • ‘With the decline in traditional patriarchy came a more virulent emphasis on female sexual fidelity and greater idealization of family harmony.’
      • ‘Is sexual fidelity simply an elaborate social contract to keep the peace?’
      • ‘However, partner choice and partner fidelity can act independently of each other, and therefore the two mechanisms need to be distinguished.’
      • ‘Relationship experiences included status, selectiveness with partners, importance of steady partners, fidelity, and communication.’
      • ‘The study also revealed that only 7 couples had actually maintained sexual fidelity and none of the seven had been together more than 5 years.’
      • ‘When was this promise of obedience and sexual fidelity made?’
      • ‘Marriage is still glamorous and still thought to include, as an aspiration, lifelong sexual fidelity.’
      • ‘Young women were expected to show sexual fidelity to their dating partner, but males were not.’
      faithfulness, loyalty, constancy
      View synonyms
  • 2The degree of exactness with which something is copied or reproduced.

    ‘the 1949 recording provides reasonable fidelity’
    • ‘The result is maximum fidelity: a picture whose clarity, brilliance and color must be seen to be believed.’
    • ‘Dynamic range and fidelity are limited by the source elements, but the sound does what is expected of it.’
    • ‘This provides a measure of the potential fidelity of paleoecological reconstructions based on small samples of avian remains.’
    • ‘It is a method for maximizing fidelity and dynamic range for a region of interest within a digitized medical image display.’
    • ‘While he demonstrates admirable aural fidelity to the concept, ideally a more musically compelling evocation would have made a stronger impression.’
    • ‘Actually, this is a pretty decent mix sporting dynamic range and medium fidelity.’
    • ‘The juxtaposition demonstrates the startling fidelity with which the director recreated his vision on screen.’
    • ‘It's been accused of having marginal audio fidelity, easily scratched, too expensive and too easy to copy.’
    • ‘It may even be possible for MP3 players to save energy by playing tunes at a slightly lower fidelity without a noticeable change in audio quality.’
    • ‘As technology improves, these documents will continually approach actual performance fidelity.’
    • ‘The difference in audio fidelity between the iTunes options and WMA is quite striking to anyone with a decent pair of ears.’
    • ‘It would be unreasonable to expect a soundcard costing a few hundred dollars to approach the audio fidelity of a home system costing several times that amount.’
    • ‘When you have a repertoire of moves, you have fidelity in copying.’
    • ‘For all that we now quest for absolute fidelity in recordings, I like the comforting scratch of an old record.’
    • ‘There's not a lot to report about this mix - it has little in the way of fidelity or dynamic range.’
    • ‘Because the genetic complement of the resultant daughter cells must be the same as the parental cell, DNA replication must possess a very high degree of fidelity.’
    • ‘The sound has apparently been cleaned up substantially and given the limited degree of fidelity, does a fine job conveying both the dialogue and the rather hypnotic background music.’
    • ‘The optical quality of the medium makes this fidelity possible by minimizing distortion.’
    • ‘Dynamic range and fidelity are only slightly present with most all of the soundstage filtering through the front and center speakers only.’
    • ‘Audio is Dolby Digital two-channel mono, with reasonable fidelity and a high degree of clarity.’
    accuracy, exactness, exactitude, precision, preciseness, correctness, scrupulousness
    View synonyms


Late Middle English: from Old French fidelite or Latin fidelitas, from fidelis ‘faithful’, from fides ‘faith’. Compare with fealty.