supererogation

/ˌsupərˌɛrəˈɡeɪʃən/
noun
  1. Doing more than is required or expected; going beyond one's duty.
    • Her volunteer work on weekends was an act of supererogation, as she already fulfilled her job duties.
    • The teacher praised the student's supererogation in completing extra credit assignments.
    • In many cultures, acts of supererogation are seen as especially noble.
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