Accuracy, or exact correspondence to some given quality or fact.
Faithfulness to one's duties.
Loyalty to one's spouse or partner, including abstention from cheating or extramarital affairs.
The degree to which a system accurately reproduces an input.
Those qualities or features that are imperfect; the characteristic, state, or quality of being imperfect.
Something that makes something else less than perfect; a blemish, impurity, error, etc.