fidelity

Fidelity is the quality of being faithful or loyal. Dogs are famous for their fidelity.

Fidelity comes from the Latin root fides, which means faith, so fidelity is the state of being faithful. Marital fidelity is faithfulness to your spouse. If you're a journalist, your reports should have fidelity to the facts. Someone without fidelity to a religion or group belief is called an infidel.

Definitions of fidelity
  1. noun
    the quality of being faithful
    synonyms: faithfulness
    see moresee less
    Antonyms:
    infidelity, unfaithfulness
    the quality of being unfaithful
    types:
    show 7 types...
    hide 7 types...
    constancy
    faithfulness and dependability in personal attachments (especially sexual fidelity)
    dedication
    complete and wholehearted fidelity
    loyalty, trueness
    the quality of being loyal
    staunchness, steadfastness
    loyalty in the face of trouble and difficulty
    allegiance, fealty
    the loyalty that citizens owe to their country (or subjects to their sovereign)
    nationalism, patriotism
    love of country and willingness to sacrifice for it
    regionalism
    loyalty to the interests of a particular region
    type of:
    quality
    an essential and distinguishing attribute of something or someone
  2. noun
    accuracy with which an electronic system reproduces the sound or image of its input signal
    see moresee less
    type of:
    accuracy, truth
    the quality of being near to the true value
Word Family
EDITOR’S CHOICE

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.

SAT/PSAT

$29.95
  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week

TOEFL

$29.95
  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week