The number three; three things together; a ternary or triplet.(noun)
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Use "ternion" in a sentence
"Heaven and Earth, he may with Heaven and Earth form a ternion."
"The play of chances which brings up a ternion or a quaternion is nothing compared to what has been required to prevent the combination of which I am reaping the fruits from being disturbed."
"Able to assist the transforming and nourishing powers of Heaven and Earth, he may with Heaven and Earth form a ternion [2]. '"