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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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