ternary vs ternion

ternary and ternion both are nouns.

Word	Noun	Adjective	Verb	Adverb
ternary	Yes	Yes	No	No
ternion	Yes	No	No	No

As nouns, ternary and ternion are synonyms defined as:

ternary and ternion: the cardinal number that is the sum of one and one and one

Other synonyms of ternary include 3, deuce-ace, III, leash, tercet, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, triplet, troika.

ternary (noun)	ternion (noun)
the cardinal number that is the sum of one and one and one	the cardinal number that is the sum of one and one and one

ternary (adjective)	ternion (adjective)
having three units or components or elements