verb (used with object)
to place, put, or set.
to lay down or assume as a fact or principle; postulate.
something that is posited; an assumption; postulate.

1640–50; < Latin positus, past participle of pōnere to place, put

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World English Dictionary
posit (ˈpɒzɪt)
1.  to assume or put forward as fact or the factual basis for an argument; postulate
2.  to put in position
3.  a fact, idea, etc, that is posited; assumption
[C17: from Latin pōnere to place, position]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1647, from L. positus, pp. of ponere "put, place" (see position).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
One major problem with the theory, she writes, is that short-term memory turns
  out to be much more complex than the model posits.
The second argument posits that sharing personal information online will
  prevent naturally-inclined introverts from staying so.
He posits not only laws but also a law-enforcement agency: a computer.
With the aid of some algorithms, he posits, that information could help us
  identify things to do or new people to meet.
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