Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
supererogatory is an adjective meaning "more than is needed, desired, or required". It carries one recorded sense.
more than is needed, desired, or required
“trying to lose excess weight”
“found some extra change lying on the dresser”
“yet another book on heraldry might be thought redundant”
“skills made redundant by technological advance”
“sleeping in the spare room”
“supernumerary ornamentation”
“it was supererogatory of her to gloat”
“delete superfluous (or unnecessary) words”
“extra ribs as well as other supernumerary internal parts”
“surplus cheese distributed to the needy”
Definitions, synonyms and semantic relations for supererogatory come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.