noun
character expansion factor
Computing term for the ratio by which character width is enlarged in text rendering or layout.
このフォントの文字幅拡大率を1.2に設定すると、文字が横に少し広がります。
If you set the character expansion factor of this font to 1.2, the characters will widen slightly horizontally.
Compound of 文字 (character), 幅 (width), 拡大 (expansion), and 率 (rate/factor). A technical term formed from standard Sino-Japanese morphemes.