
Lines per inch (LPI) is a measurement of printing resolution. A line consists of halftones that is built up by physical ink dots made by the printer device to create different tones. Specifically LPI is a measure of how close together the lines in a halftone grid are. The quality of printer device or screen determines how high the LPI will be. Hig...
Found on
http://en.wikipedia.org/wiki/Lines_per_inch

The number of lines or rows of dots there are per inch in a screen and therefore in a screen tint, halftone, or separation.
Found on
http://www.e-printing.co.uk/glossary.htm
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