Etymology
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cpu 

also c.p.u., by 1970, abbreviation of central processing unit.

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ohm (n.)
unit of electrical resistance, 1867, in recognition of German physicist Georg S. Ohm (1789-1854), who determined the law of the flow of electricity. Originally proposed as ohma (1861) as a unit of voltage. Related: ohmage; ohmic; ohmeter.
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sku (n.)
by 1974, acronym from stock-keeping unit.
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lev (n.)
monetary unit of Bulgaria, introduced 1881, literally "lion" (compare leu).
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millibar (n.)

unit of barometric pressure, by 1910, from milli- + bar (n.4).

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volt (n.)
unit of electromotive force, 1873, back-formation from voltaic.
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dyne (n.)

in physics, the metric unit of force, 1873, from a specialized scientific use of of Greek dynamis "power" (see dynamic (adj.)); perhaps also influenced by French dyne, which had been proposed c. 1842 as a unit of force in a different sense.

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mil (n.)

1721, in per mil "per thousand," from Latin mille "thousand" (see million); compare percent. As a unit of length for diameter of wire (equal to .001 of an inch) it is attested from 1891; as a unit of angular measure it is recorded by 1907.

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megaton (n.)

unit of explosive power equal to one million tons of TNT, 1952, from mega- "million" + ton. Related: Megatonnage.

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yuan (n.)
Chinese unit of currency introduced 1914, from Chinese yuan "round, round object, circle."
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