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]
She began to doubt her husband's 'fidelity'. [=to wonder if he was having an affair with another woman]
a printer with outstanding color 'fidelity' [=a printer that produces very accurate colors]
(..) before it even hit the water. And just as fast, he snapped clean through that line. Well, you can see my predicament. My wedding ring, the symbol of fidelity to my wife... ...soon to be mother of my child... - Make him stop. ...was now lost in the gut of an uncatchable fish. What did you do? (..)2003 Big Fish