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monospace

/ˈmɑːnoʊspeɪs/

having equal-width characters throughout

From Greek mono (one) + Latin space (room).

adjective
mono
Greek
monos (μόνος)
single, alone
Scientific/Modern English
mono-
prefix meaning one or single
space
Latin
spatium
room, area, stretch of time
Old French
espace
distance, interval
Middle English
space
room, extent, interval
Combined
monospace
coined in modern technical English for equal-width type
Modern English
monospace font
a font where each character takes the same horizontal width
Modern English
monospaced
adjective describing that type style
Modern English
monospace

A monospace font is a tiny democracy of letters: every character gets exactly the same seat at the table. The word is a neat modern mash-up—Greek mono- for “one” glued to the very old, very roomy space, a descendant of Latin spatium, which could mean a stretch of ground or even a stretch of time. That second half has a surprising pedigree, showing up in English long before computers, when printers needed literal blank spaces of metal between words. So the term ends up describing a typeface where an i and an m are forced to behave like twins, one narrow, one broad, but both allotted the same width. It’s a little linguistic joke from the age of keyboards: one space for every letter, whether the letter wants it or not.

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