A feeling of compunction, or deep regret, for a sin or wrong committed. Unlike regret, remorse is felt about a sin or moral wrong whereas regret is felt about what is in some way undesirable, but not particularly so. Regret, but not remorse, can be felt about an event for which the agent does not take himself/herself to be even just causally responsible. Remorse is always felt about an event which the agent sees as an action of his/hers.
Taylor, G. (1996). Guilt and remorse. In Harre, R. & Parrot, W.G. (Eds.) The Emotions: Social, Cultural and Biological Dimensions. London: Sage, 57-73.