verb: To reduce by one third; especially, kill one third of (a group of people).
verb: (obsolete) To increase by half as much again; especially to increase the price in this way.
verb: (rare, obsolete) To do or perform three times or for the third time.
verb: To divide into three parts, especially to divide into thirds.
verb: (firearms) 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.
noun: The third year of training in various Christian religious orders (especially the Jesuits).
noun: One who is in their tertiate training.
noun: The third classification of animals in some ranked taxonomic systems, such as that proposed by Linnaeus.