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]
(..) Odinson... the rightful king of Jotunheim... god of mischief... do hereby pledge to you... my undying fidelity. Undying? You should choose your words more carefully. You... will never be... (..)2018 Avengers: Infinity War