fi·del·i·ty 
/fəˈdɛləti/ noun
/fəˈdɛləti/ noun [noncount] 1 a : the quality of being faithful to your husband, wife, or sexual partner
▪ She began to doubt her husband's fidelity. [=to wonder if he was having an affair with another woman] ▪ sexual fidelity — often + to ▪ his fidelity to his wife — opposite infidelity
b : the quality of being faithful or loyal to a country, organization, etc. — usually + to ▪ No one can doubt his fidelity [=devotion] to his country. 2 : the degree to which something matches or copies something else — + to ▪ The movie's director insisted on total fidelity to the book. [=insisted that the story told in the movie should accurately copy the story told in the book] 3 : the degree to which a device (such as a CD player, radio, or television) correctly reproduces sounds, pictures, etc.
▪ music with much higher fidelity than on cassettes ▪ a printer with outstanding color fidelity [=a printer that produces very accurate colors] — see also high fidelity
▪ She began to doubt her husband's fidelity. [=to wonder if he was having an affair with another woman] ▪ sexual fidelity — often + to ▪ his fidelity to his wife — opposite infidelity
b : the quality of being faithful or loyal to a country, organization, etc. — usually + to ▪ No one can doubt his fidelity [=devotion] to his country.
▪ music with much higher fidelity than on cassettes ▪ a printer with outstanding color fidelity [=a printer that produces very accurate colors] — see also high fidelity
