understood without being openly expressed; implied: tacit approval.
silent; saying nothing: a tacit partner.
unvoiced or unspoken: a tacit prayer.

1595–1605; < Latin tacitus silent, past participle of tacēre to be silent (cognate with Gothic thahan; akin to Old Norse thegja)

tacitly, adverb
tacitness, noun

1. unexpressed, unspoken, unsaid, implicit.

1. expressed.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tacit (ˈtæsɪt)
1.  implied or inferred without direct expression; understood: a tacit agreement
2.  created or having effect by operation of law, rather than by being directly expressed
[C17: from Latin tacitus, past participle of tacēre to be silent]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1604, from Fr. tacite, from L. tacitus "that is passed over in silence, done without words, assumed, silent," prop. pp. of tacere "to be silent," from PIE base *tak- "to be silent" (cf. Goth. þahan, O.N. þegja "to be silent," O.N. þagna "to grow dumb," O.S. thagian, O.H.G. dagen "to
be silent"). The musical instruction tacet is the 3rd person present sing. of the L. verb.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Tacitly some adherents may have hoped for the regime's collapse.
They tacitly talked about trying to turn into a consulting company that helped
  other companies build privacy into their products.
But then the government, which had tacitly allowed such arrangements before,
  put its foot down.
Weapons development was more tacitly than explicitly expressed in the tropes
  and themes.
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