What is "tertiate"

Tertiate \Ter"ti*ate\, v. t. [L. tertiatus, p. p. of tertiare to do for the third time, fr. tertius the third.]

1. To do or perform for the third time. [Obs. & R.]
   --Johnson.

2. (Gun.) 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.

vb. 1 (l en reduce Reduce) by one (l en third); (non-gloss definition: especially), (l en kill) one third of (a (l en group) of (l en person people)). 2 (context rare obsolete English) To do or perform for the third time. 3 (context firearms English) 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.