noun Often followed by to or towards: faithfulness or loyalty towards a person, a group, one's civic or moral duties, etc.; allegiance; an instance of this.
the fidelity of the civil servants to their country
noun Faithfulness or loyalty to one's partner or spouse, including restraint from romantic or sexual relationships with third parties.
noun Faithfulness to God and one's religion.
noun Accuracy, or exact correspondence, to some given fact or quality; exactness.
noun Accuracy, or exact correspondence, to some given fact or quality; exactness.
noun The closeness of association between an organism and a plant community.
noun Chiefly in high fidelity, low fidelity, etc.: the degree to which a system accurately reproduces an input such as an image or sound.
noun In by one's fidelity, to break fidelity, to give fidelity, etc.: one's pledge or promise to act in good faith; an oath, a word of honour. Of a person: honesty, trustworthiness; an instance of this.