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dot matrix

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noun Computers.
  1. a method of forming characters and graphics, used by CRTs and other screens, some printers (dot-matrix printers), and some plotters, by creating the desired pattern using dots from a dense matrix.
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Origin of dot matrix

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018