dots per inch: a measure of resolution used for printed text or images, the more dots per inch, the higher the resolution.
British Dictionary definitions for dpi
dpi
abbreviation
1.
dots per inch: a measure of the resolution of a typesetting machine, computer screen, etc
dpi in Technology
Dots per inch. A measure of resolution for printers, scanners and displays. Laser printers typically reach 300 DPI, though 600 DPI is becoming more common. Commercial typesetters are usually around 1200 DPI. (1995-01-05)