tap / space
Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Shortened, via clipping or abbreviation, from various English terms. Ultimately related to Latin quattuor (“4”); compare quadri-, quadruple. The typography senses are from the abbreviation quad. for obsolete quadrat; the keyboard command comes from the verb sense.
quadruplet
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tap / space
Classic usage
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