Lewis & Short

dēsignātor or dissignātor (the latter form freq. in inscrr., and preferred by Brambach; so Keller, ad Hor. Ep. 1, 7, 5; Corp. Inscr. Lat. pp. 597, 768), ōris, m. [designo], one who regulates or arranges; a regulator.
As a t. t.,

  1. I. An officer whose duty it was to assign seats in the theatre, Plaut. Poen. prol. 19.
  2. II. A master of ceremonies at funerals; an undertaker, Hor. Ep. 1, 7, 5; Sen. Ben. 6, 38; Tert. Spectac. 10; Inscr. Orell. 934; cf. Don. Ter. Ad. 1, 2, 7.
  3. III. An umpire at public spectacles, i. q. Gr. βραβευτής, Dig. 3, 2, 4, § 1; Cic. Att. 4, 3, 2.