Terna is a 5 letter English word.
You can make 80 anagrams from letters in terna (aenrt).
1880-85; short for New Latin terna nōmina three names together, feminine of ternus. See tern2
terna, a kind of tax (not to be confounded with the Tertiae or the Trina Illatio), iii.
It seems like an attempt at overruling the "terna fœdera rerum."
And now had come a fateful moment in the history of Roma terna.