[law-see, los-ee]
adjective Electricity.
(of a material or transmission line) causing appreciable loss or dissipation of energy.

1945–50; loss + -y1

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World English Dictionary
lossy (ˈlɒsɪ)
Compare lossless (of a dielectric material, transmission line, etc) designed to have a high attenuation; dissipating energy: lossy line
[C20: from loss]

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

"characterized by loss," a term in electrical engineering, from loss + -y (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

lossy definition

A term describing a data compression algorithm which actually reduces the amount of information in the data, rather than just the number of bits used to represent that information. The lost information is usually removed because it is subjectively less important to the quality of the data (usually an image or sound) or because it can be recovered reasonably by interpolation from the remaining data.
MPEG and JPEG are examples of lossy compression techniques.
Opposite: lossless.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Lossy compression is a type of compression where a certain amount of information is discarded.
As an aside, the time may soon come when storage is so cheap that there is no need for lossy compression.
Lossy compression, on the other hand, means some data are lost during shrinking.
Light that fits cannot escape the tapered mirror crevices of the two sharp sides, with lossy reflection at each bounce.
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