tacit

Tacit comes from late Middle French tacite, or directly from Latin tacitus, meaning "passed over in silence" or "assumed as a matter of course." That Latin word traces back to the verb tacere, "to be silent."

The word entered English carrying its Latin sense intact — something understood without being stated — and that meaning has held steady ever since.

The facts here only trace tacit back to Latin tacere, "to be silent" — no other English cognate is given to connect it to.