Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
The deliberate concurrence in another person's usually sinful action. The co-operation is formal and always sinful if, besides giving external help of whatever kind, one interiorly wants the evil action to be performed. Formal co-operation is at least a sin against charity by doing spiritual harm to one's neighbor; frequently it is also a sin against another virtue, especially of justice.