Synonyms for Ternary:

adj.

all (adjective)
treble, triple.
three (adjective)
treble, triangular, clover-like, triple, deltoid, Triadic.
threefold (adjective)
trine.
triple (adjective)
threefold, triplicate, Trebled, triple, three-ply.

n.

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

Other synonyms:

III
iii.
Other relevant words:
tercet, leash, three, trine, troika, ternion, threefold, trey, tierce, trinity, 3, treble, terzetto, iii, triplet, multiple, trio, triad, deuce-ace.