All 5 Uses

fidelity
in
The Count of Monte Cristo
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"This paper, my friend," said Faria, "I may now avow to you, since I have the proof of your fidelity—this paper is my treasure, of which, from this day forth, one-half belongs to you."†
Chpt 17-18 *
There he told the chief all—his affection for the prisoner, their promises of mutual fidelity, and how every night, since he had been near, they had met in some neighboring ruins.†
Chpt 33-34
A freezing politeness, a strict fidelity to government principles, a profound contempt for theories and theorists, a deep-seated hatred of ideality,—these were the elements of private and public life displayed by M. de Villefort.†
Chpt 47-48
"Still," said Barrois, with the freedom and fidelity of an old servant, "if M. Noirtier asks for a notary, I suppose he really wishes for a notary; therefore I shall go at once and fetch one."†
Chpt 57-58
She was fearful of exciting any remark, and believed firmly in her daughter's innocence and fidelity to the paternal roof.†
Chpt 99-100

Definitions:

(1) (fidelity as in: fidelity to her partner)
faithfulness -- especially exclusiveness of sexual partners
(2) (fidelity as in: fidelity of the reproduction)
accuracy with which something is copied or converted
(3) (meaning too rare to warrant focus)