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\ ˈbərn-ˌin 
\
\Definition of burn-in
(Entry 1 of 2)
: the continuous operation of a device (such as a computer) as a test for defects or failure prior to putting it to use
burn in
verbburned in or burnt in; burning in; burns in
Definition of burn in (Entry 2 of 2)
: to increase the density of (portions of a photographic print) during enlarging by giving extra exposure
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The first known use of burn-in was circa 1939
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