built so as to be an integral and permanent part of a larger construction: The wall has a built-in bookcase.
existing as a natural or characteristic part of something; inherent: a built-in contempt for daydreaming.
a built-in piece of furniture or appliance.
an additional feature or capability, as of a machine or a service: a car with power steering, power brakes, and other built-ins.


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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  made or incorporated as an integral part: a built-in cupboard; a built-in escape clause
2.  essential; inherent
3.  (Austral) a built-in cupboard or wardrobe

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

built-in definition

(Or "primitive") A built-in function or operator is one provided by the lowest level of a language implementation. This usually means it is not possible (or efficient) to express it in the language itself. Typical examples are the basic arithmetic and Boolean operators (in C syntax: +, -, *, /, %, !, &&, ||), bit manipulation operators (~, &, |, ^) and I/O primitives. Other common functions may be provided in libraries but are not built-in if they are written in the language being implemented.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Rove's books fill row after row of built-in shelves in his house.
The built-in cast-iron handles make it easy to pull out of the oven with pot
There were built-in barriers and structure that stood in the way of our current
  chaotic eating.
The technical device of a built-in exit might be superseded by the political
  reality of a built-in escalation.
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