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English definition of “dpi”

dpi

noun [U] (also DPI)    
IT abbreviation for dots per inch : the number of dots (= small spots ) of ink a printer , etc., can produce in each line measuring one inch . An image with more dots looks clearer : a 300 dpi photo / image a 600 dpi printer / scanner The laser printer has a resolution of 600 dpi.
(Definition of dpi noun from the Cambridge Business English Dictionary © Cambridge University Press)
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