Webster's English Dictionary

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supererogatory

su.per.erog.a.to.ry \.su:-p*-ri-'ra:g-*-.to-r-e-, -.to.r-\ aj 1: observed 
   or performed to an extent not enjoined or required  2: SUPERFLUOUS, 
   NONESSENTIAL N mean done without need or compulsion or warrant. 
   SUPEREROGATORY implies a giving above what is required by rule and may 
   suggest adding something not needed or not wanted; GRATUITOUS usu. applies 
   to something offensive or unpleasant given or done without provocation; 
   UNCALLED-FOR adds to GRATUITOUS implication of impertinence or logical 
   absurdity; WANTON implies not only a lack of provocation but a malicious or 
   sportive motive SYN syn SUPEREROGATORY, GRATUITOUS, UNCALLED-FOR, WANTO