fidelity
n. uncountable B2 Upper Intermediate US //ˌfaɪˈdɛɫəti// UK //fɪdˈɛlɪti// fi·deli·ty
n. the quality of being loyal and faithful to a person, cause, or promise. You use this word to describe someone who keeps their word or stays true to their beliefs.
n. the state of being faithful, loyal, or true to a person, cause, or duty; strict adherence to facts or details.
Her fidelity to the project kept the team motivated.
The translator's fidelity to the original text preserved the author's unique voice.
In an era of shifting alliances, his unwavering fidelity to the founding principles of the organization stood out as a rare and stabilizing force.