Etymology
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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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meter (n.2)

also metre, "fundamental unit of length of the metric system," originally intended to be one ten-millionth of the length of a quadrant of the meridian, 1797, from French mètre (18c.), from Greek metron "measure," from PIE root *me- (2) "to measure." Developed by French Academy of Sciences for system of weights and measures based on a decimal system originated 1670 by French clergyman Gabriel Mouton.

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androgynous (adj.)

1620s, "womanish" (of a man); 1650s, "having two sexes, being both male and female," from Latin androgynus, from Greek androgynos "hermaphrodite, male and female in one; womanish man;" as an adjective (of baths) "common to men and women," from andros, genitive of anēr "male" (from PIE root *ner- (2) "man") + gynē "woman" (from PIE root *gwen- "woman"). Related: Androgynal (1640s).

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homosexual (n.)

"homosexual person," by 1895, from homosexual (adj.). In technical use, either male or female; but in non-technical use almost always male. Slang shortened form homo attested by 1929.

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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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fanboy (n.)

"young male enthusiast," by 1988, from fan (n.2) + boy. Fangirl attested from 1989.

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p.a. (n.)

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

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