fidelity
/ˌfaɪˈdɛɫəti/
faithfulness to a person, cause, or belief
fidelity in a sentence
“His fidelity to his principles never wavered.”
Origin of fidelity
Latin fidelitas faithfulness (from fidelis faithful, from fides faith)
Related Words
allegiance
loyalty or commitment to a group or cause
devotion
love, loyalty, or enthusiasm for something
fealty
formal acknowledgment of loyalty to a lord
credibility
the quality of being trusted and believed in
veracity
conformity to facts; accuracy; habitual truthfulness
authenticity
the quality of being genuine or true