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proportional spacing

British  

noun

  1. a feature of some typewriters and other output devices whereby the space allotted to each character is determined by the width of the character

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Instead of typesetters the paper employed typists, using special proportional spacing typewriters which made all lines come out even.

From Time Magazine Archive