ETYMOLOGY
from Latin tacentem, present participle of tacere (to be silent)
EXAMPLE
“…And although he was much angred thereat, yet he seemed to be glad: and because he would obliege him further, he went vvith all his Court. Great was the resort thither of Ladies & Knights, and at the Kings entrance there was a fair Tragedy, whose subject I will be tacent of.…”
From: The Loves and Adventures of Clerio & Lozia.: A Romance
By Antoine Du Périer
Translation by F. Kirkman, 1652
Lexicophilia 