Late 17th century; earliest use found in John Owen (1616–1683), theologian and Independent minister. From classical Latin repraesentāt-, past participial stem of repraesentārerepresent + -ory, probably after either representation or post-classical Latin repraesentatorius.
Definition of representatory in US English:
representatory
adjectiveˌrɛprɪz(ɛ)nˈteɪt(ə)ri
rare
Of the nature of or relating to representation.
Origin
Late 17th century; earliest use found in John Owen (1616–1683), theologian and Independent minister. From classical Latin repraesentāt-, past participial stem of repraesentāre represent + -ory, probably after either representation or post-classical Latin repraesentatorius.