Search Result for "supererogation": 
Wordnet 3.0

NOUN (1)

1. an effort above and beyond the call of duty;


The Collaborative International Dictionary of English v.0.48:

Supererogation \Su`per*er`o*ga"tion\, n. [L. supererogatio a payment in addition.] The act of supererogating; performance of more than duty or necessity requires. [1913 Webster] Works of supererogation (R. C. Ch.), those good deeds believed to have been performed by saints, or capable of being performed by men, over and above what is required for their own salvation. [1913 Webster]
WordNet (r) 3.0 (2006):

supererogation n 1: an effort above and beyond the call of duty