An act that goes beyond what is required or expected, particularly in moral or ethical contexts.

अतिरिक्त कार्य

English Usage: His voluntary work for the community was seen as an act of supererogation.

Hindi Usage: समुदाय के लिए उनका स्वैच्छिक काम अतिरिक्त कार्य के रूप में देखा गया।