Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: French
Origin: fidélité, from Latin fidelitas, from fides 'faith, trust'

fidelity

noun
     
fi‧del‧i‧ty [uncountable] formal
1 when you are loyal to your husband, girlfriend etc, by not having sex with anyone else [= loyalty; ≠ infidelity]:
the importance of marital fidelity (=in marriage)
2 when you are loyal to a person, an organization, or something that you believe in [= loyalty]
fidelity to
his fidelity to the company over 25 years
3A formal how much a film, a piece of written work etc remains unchanged from an earlier piece of work, or the facts that are known
fidelity to
the movie's fidelity to the original book

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