Etymology
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supererogatory (adj.)

1590s, from Medieval Latin supererogatorius, from supererogat-, stem of supererogare "pay or do additionally" (see supererogation).

updated on December 29, 2013

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Definitions of supererogatory from WordNet

supererogatory (adj.)
more than is needed, desired, or required;
it was supererogatory of her to gloat
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.