The Collaborative International Dictionary of English v.0.48:

Fidelity \Fi*del"i*ty\, n. [L. fidelitas: cf. F. fid['e]lit['e].
   See Fealty.]
   Faithfulness; adherence to right; careful and exact
   observance of duty, or discharge of obligations. Especially:
   (a) Adherence to a person or party to which one is bound;
       loyalty.
       [1913 Webster]

             Whose courageous fidelity was proof to all danger.
                                                  --Macaulay.
       [1913 Webster]

             The best security for the fidelity of men is to
             make interest coincide with duty.    --A. Hamilton.
   (b) Adherence to the marriage contract.
   (c) Adherence to truth; veracity; honesty.
       [1913 Webster]

             The principal thing required in a witness is
             fidelity.                            --Hooker.

   Syn: Faithfulness; honesty; integrity; faith; loyalty;
        fealty.
        [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

130 Moby Thesaurus words for "fidelity":
   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



The Devil's Dictionary (1881-1906):

FIDELITY, n.  A virtue peculiar to those who are about to be betrayed.


U.S. Gazetteer Places (2000):

Fidelity, IL -- U.S. village in Illinois
   Population (2000):    105
   Housing Units (2000): 44
   Land area (2000):     0.111560 sq. miles (0.288938 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.111560 sq. miles (0.288938 sq. km)
   FIPS code:            25960
   Located within:       Illinois (IL), FIPS 17
   Location:             39.154636 N, 90.163947 W
   ZIP Codes (1990):     62030
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Fidelity, IL
    Fidelity


U.S. Gazetteer Places (2000):

Fidelity, MO -- U.S. town in Missouri
   Population (2000):    252
   Housing Units (2000): 106
   Land area (2000):     0.967454 sq. miles (2.505695 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.967454 sq. miles (2.505695 sq. km)
   FIPS code:            24120
   Located within:       Missouri (MO), FIPS 29
   Location:             37.078350 N, 94.312165 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Fidelity, MO
    Fidelity