The quality of being expedient or advantageous; fitness or suitableness to effect a purpose intended; adaptedness to self-interest; desirableness; advantage; advisability; -- sometimes contradistinguished from moral rectitude.
The modern view of criminal justice, broadly, is that public concern with morality or expediency decrees expiation for the violation of a norm; this concern finds expression in the infliction of punishment on the evil doer by agents of the state, the evil doer, however, enjoying the protection of a regular procedure. Max Weber
When virtue is lost, benevolence appears, when benevolence is lost right conduct appears, when right conduct is lost, expedience appears. Expediency is the mere shadow of right and truth; it is the beginning of disorder. Lao Tzu