This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Faithfulness to obligations, duties, or observances.

n. Exact correspondence with fact or with a given quality, condition, or event; accuracy.

n. The degree to which an electronic system accurately reproduces the sound or image of its input signal.

n. Faithfulness to one's duties.

n. Loyalty to one's spouse or partner, including abstention from extramarital affairs (except in an open marriage).

n. Accuracy, or exact correspondence to some given quality or fact.

n. The degree to which a system accurately reproduces an input.

n. Adherence to a person or party to which one is bound; loyalty.

n. Adherence to the marriage contract.

n. Adherence to truth; veracity; honesty.

n. Good faith; careful and exact observance of duty or performance of obligations: as, conjugal or official fidelity.

n. Faithful devotion or submission; unswerving adherence; close or exact conformity; fealty; allegiance: as, fidelity to a husband or wife, or to a trust; fidelity to one's principles or to instructions; the dog is the type of fidelity.

n. Faithful adherence to truth or reality; strict conformity to fact; truthfulness; exactness; accuracy: as, the fidelity of a witness, of a narrative, or of a picture.

n. An order of Portugal, founded by John VI. in 1823 for the supporters of the monarchy during the insurrectionary movements in that country. Synonyms Faith, integrity, trustiness, trustworthiness, conscientiousness; Constancy, Faithfulness, etc. (see firmness).

n. accuracy with which an electronic system reproduces the sound or image of its input signal

n. the quality of being faithful

"He thanked me many times for what he termed my fidelity to his sainted friend."

infidelity   

truth    accuracy   

order of fidelity   

faith   

fidelitous    high fidelity    fidelity bond   

honesty    fealty    faith    integrity    faithfulness    loyalty    veracity   

loyalty    honesty    constancy    obedience    integrity    faithfulness    generosity    diligence    bravery    patriotism