kerning

/ˈkɜːnɪŋ/

IPA: /K ER1 N IH0 NG/

verb
  1. 1

    (chiefly proportional font printing) To adjust the horizontal space between selected pairs of letters (characters or glyphs); to perform such adjustments to a portion of text, according to preset rules.

noun
  1. 1

    The adjustment of the horizontal space between selected pairs of glyphs in a typeface.

Source: https://en.wiktionary.org/wiki/kern, https://en.wiktionary.org/wiki/kerning