terˈnal adjective

Threefold

terˈnary adjective

1. In threes
2. Consisting of three components
3. Based on three
4. To the base three (mathematics)
5. Of a third order

A triad

terˈnate adjective

1. Consisting of three leaflets (botany)
2. Grouped in threes

terˈnately adverb

terˈnion noun

1. A triad
2. A section of paper for a book containing three double leaves or twelve pages

ternary form noun (music)

A structure in which a first subject is followed by a second and then a repetition of the first