Synonyms for Ternion:

n.

ternion (noun)
iii, deuce-ace, tierce, ternary, leash, trinity, trey, terzetto, triad, three, 3, trine, troika, tercet, trio, triplet.
three (noun)
trio, ternary.
triad (noun)
three.
trio/triple (noun)
triad, trey, trinity, triplet, troika, trine, leash.

Other synonyms:

III
iii.