TERNION
Meaning of TERNION in English
/terr"nee euhn/ , n.
a set or group of three; triad.
[ 1580-90; ternion- (s. of ternio ) triad. See TERN 2 , -ION ]
Random House Webster's Unabridged English dictionary.
Полный английский словарь Вебстер - Random House .
2012