Wordiyo
RootsVocabularyCoursesGuidesMy WordsPricing
Wordiyo

Build your English vocabulary systematically through roots and etymology.

Explore

  • Roots
  • Vocabulary
  • My Words

Learn

  • Guides
  • Pricing

Company

  • About
  • Terms
  • Privacy

© 2026 Wordiyo.

  1. Home
  2. /fid
  3. /fidelity

fidelity

UK/fi'deliti/US
IELTSTOEFLB2

Definitions

n.

Faithfulness and loyalty to a person, cause, or duty

忠诚,忠实

n.

The degree to which a copy or reproduction is accurate (esp. of sound)

(尤指声音的)保真度,逼真度

Root Breakdown

Root-derived
fidfaith, trust, confidence
+
-elstate, quality, condition
+
-itystate, quality, condition
=fidelity

fid (faith) + -ity (state) = the state of being faithful. Between people it means loyalty (marital fidelity, fidelity to a cause). Engineers borrowed it for sound: 'high fidelity' means a recording stays faithful to the original — the same idea of staying true, applied to audio.

Root fid still carries 16 more words

Why It Means This

One word, two worlds — but the same core idea: staying true. Human fidelity is staying true to a partner or a promise; audio fidelity is a recording staying true to the real sound. The leap from morals to machines happened because engineers needed a word for 'faithful reproduction,' and Latin fidēs already meant exactly that.

Common Collocations

  • 1.fidelity to忠于
  • 2.marital fidelity婚姻忠诚
  • 3.high fidelity高保真
  • 4.with great fidelity极为忠实地

Example Sentences

  • 1.

    The novel explores themes of love and fidelity.

  • 2.

    The translation reproduces the original with great fidelity.

  • 3.

    High-fidelity speakers reproduce sound with remarkable clarity.

Word Forms

Noun

Pluralfidelities
← Back to fid