Definitions
1.NounA third.
2.NounSynonym of terce: the third canonical hour or its service.
3.NounA cask of a certain size, or its volume used as a measure of capacity. Larger than a barrel but smaller than a hogshead.
4.NounThe third tone of the scale. See mediant.
5.NounA sequence of three playing cards of the same suit. Tierce of ace, king and queen is called tierce-major.
6.NounThe third defensive position, with the sword hand held at waist height, and the tip of the sword at head height.
7.NounAn ordinary that covers the left or right third of the field of a shield or flag.
8.NounOne sixtieth of a second, i.e., the third in a series of fractional parts in a sexagesimal number system. (Also known as a third.)