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Webster 1913 Edition

Noun.

[L.

ternio

, fr.

terni

three each. See

Adj.

]

The number three; three things together; a ternary.

Bp. Hall.

Noun.

[L. ternarius, ternio.] The number three.

ternion ‎(plural ternions)

The number three; three things together; a ternary or triplet.
(Can we find and add a quotation of Bishop Hall to this entry?)