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supererogatory

su·per·e·rog·a·to·ry

supererogatory

 
pronunciation:
su pr ih ra g tor i
part of speech: adjective
definition: beyond that which is required, expected, or demanded.
The supererogatory investigation turned up some information that might have been better left uncovered.
derivations: supererogative (adj.), supererogatorily (adv.)