IPA: /ˈtɜːrneɪt/
KK: /ˈtɜrnɪt/
Arranged in groups of three or having three parts.
The plant has a ternate leaf structure, with three leaflets on each stem.
Ternate is derived from the Latin 'ternatus' (meaning tripled or in threes), which comes from 'terni' (meaning three each). The word 'ternate' refers to something that is arranged in groups of three or has three parts.
Think of the Latin word for three ('terni') to remember that 'ternate' means something arranged in threes.