faithfulness;loyalty
loyalty in marriage shown by having a sexual relationship only with one's husband or wife
(of sth copied or reported) closeness in sound,facts,colour,etc. to the original;exactness
They serve those that hire them..with..great Fidelity.
出自: G. Burnet
Kittiwakes form monogamous pair-bonds of exemplary fidelity.
出自: R. Dawkins