One of the mysteries of the English language finally explained.
1Lacking dimension; having no extent in any spatial dimension.
2Science. Of a physical quantity: having a numerical value independent of the choice of units of measurement; = "dimensionless". Also (of an equation): composed of dimensionless terms.
Late 19th century; earliest use found in Edwin Abbott (1838–1926), headmaster and writer. From non- + dimensional.
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