Etymology

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Today it means: Of a text character, occupying the space of two alphanumeric characters in a monospace font, or two "normal" text columns. Full definition →

Japanese 全角
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The story

  1. Japanese · calque of全角
  2. English todayfullwidth

From full + width, as a calque of Japanese 全角 (zenkaku).

Etymology from Wiktionary, CC BY-SA 4.0.