
Lossless data compression is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data. By contrast, lossy data compression permits reconstruction only of an approximation of the original data, though this usually improves compression rates (and therefore reduces file sizes). Lossle...
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http://en.wikipedia.org/wiki/Lossless_compression

A file that may be compressed, but only if it can be reconstructed to it's original state without any alteration to the source file. For this reason lossless files command a large file size with the advantage of preserving the source exactly. As such, lossless formats are not well suited for streaming.
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http://www.flv.com/glossary.html

Compression techniques that allow the original data to be recreated without loss. Contrast with lossy compression.
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http://www.videohelp.com/glossary?L

A compression technique in which smaller file sizes are achieved without the loss of any of the original data values. This is achieved by a variety of encoding schemes that allow the original data to be re-created from the compressed format.
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https://www.xrite.com/learning/other-resources/glossary
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