- consisting of or involving three; threefold; triple.
- third in order or rank.
- based on the number three.
- Chemistry.
- consisting of three different elements or groups.
- (formerly) consisting of three atoms.
- having three variables.
- (of an alloy) having three principal constituents.
- a group of three.
- consisting of three or groups of three
- maths
- (of a number system) to the base three
- involving or containing three variables
- (of an alloy, mixture, or chemical compound) having three different components or composed of three different elements
- a group of three
