Etymology
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pence (n.)

late 14c., a contraction of penies, collective plural of penny. Spelling with -ce reflects the voiceless pronunciation (compare dice (n.), deuce, hence). After the introduction of decimal currency in Britain in 1971, it began to be used in singular (one pence).

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DOS 

"computer operating system using a disk storage device," 1967, acronym of disk operating system.

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systematize (v.)

"make into a system," 1764, from French systématiser or a native formation from system (Greek stem systemat-) + -ize. Related: Systematized; systematizing.

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separatrix (n.)

a line or hooked line used to separate printed figures, originally with numerals and used where modern texts use a decimal point, 1650s, from Late Latin (linea) separatrix, feminine of separator, agent noun from separare "to pull apart" (see separate (v.)). It survives in proofreading.

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sextillion (n.)

1680s, from Latin sext-, combining form of sex "six" (see six) + ending from million. Compare billion. In English, and originally Italian, numeration, 1 to the 6th power (one followed by thirty-six zeroes); in French and U.S. use, 1,000 to the 7th power (one followed by twenty-one zeroes). Related: Sextillionth.

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drainage (n.)

1650s, "act or process of draining," from drain (v.) + -age. Sense of "the water carried off by a system of rivers" is by 1860. Meaning "system by means of which something is drained" is by 1878.

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VHS 

1982, initialism (acronym) of Video Home System.

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metric (adj.)

"pertaining to the system of weights and measures based on the meter," 1855, from French métrique, from mèter (see meter (n.2)). In this sense, metrical is attested from 1797. Metric system is attested by 1855.

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circuitry (n.)

"plan or system of electrical circuits," 1946, from circuit (n.)+ -ry.

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p.a. (n.)

abbreviation of public address (system), attested from 1936.

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