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
All effective writers and speakers have learned the convention of tacit
The first category has been around for a long time, as preparing, forming
  individuals was the tacit aim of education.
The tacit postponement has also come amid urgent reports warning of heightened
  landslide risks.
These raids are sometimes conducted with the tacit approval of the police.
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