un·writ·ten

[uhn-rit-n]
adjective
1.
not actually formulated or expressed; customary; traditional.
2.
not written; not put in writing or print; oral: an unwritten agreement.
3.
containing no writing; blank.

Origin:
1325–75; Middle English unwriten; see un-1, written


1. implicit, understood, tacit, inferred.


1. specified, stipulated, designated.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unwritten (ʌnˈrɪtən) [Click for IPA pronunciation guide]
 
adj
1.  not printed or in writing
2.  effective only through custom; traditional
3.  without writing upon it

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Unwritten is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

unwritten
mid-14c., from un- (1) "not" + pp. of write. Cf. O.E. unwriten, O.N. uritinn.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My own taste has always been for unwritten history, and my present business is
  with the reverse of the picture.
Unwritten contracts-injuries to property-fraud- other actions.
The unwritten films are red if they contain gold particles and yellow if they
  contain silver.
The consequences of breaking the unwritten code can be severe.
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