D defs.my
Entry 2 senses Webster, 1913

Tertiate

/tûrʹshĭāt/ · Ter·ti·ate · IPA /ˈtɜːʃɪeɪt/
01 v. t. To do or perform for the third time.
  1. 1.
    To do or perform for the third time.[Obs. & R.]
  2. 2.
    To examine, as the thickness of the metal at the muzzle of a gun; or, in general, to examine the thickness of, as ordnance, in order to ascertain its strength.(Gun.)