su·per·e·rog·a·to·ry /ˌsupərəˈrɒgəˌtɔri, -ˌtoʊri/

–adjective
1. going beyond the requirements of duty.
2. greater than that required or needed; superfluous.

Origin:
1585–95; < ML superērogātōrius. See supererogate, -tory

—Related forms
su·per·e·rog·a·to·ri·ly, adverb

Source: Dictionary.com.

“I willingly grant the scientist his three atoms,” said Ildefonse, “though in the strictest sense, two of these are supererogatory.”

Source: Tales of the Dying Earth by Jack Vance.

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