Etymology
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natural (n.)

"person with a natural gift or talent," 1925, originally in prizefighting, from natural (adj.). But an older sense is almost opposite to this, "half-wit, idiot" (one "naturally deficient" in intellect), which was in use 16c. to 19c. In Middle English, the word as a noun meant "natural capacity, physical ability or power" (early 14c.), and it was common in sense "a native of a place" in Shakespeare's day. Also in 17c., "a mistress."

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enclosure (n.)
mid-15c., "action of enclosing," from enclose + -ure. Meaning "that which is enclosed" is from 1550s.
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natural (adj.)

c. 1300, naturel, "of one's inborn character; hereditary, innate, by birth or as if by birth;" early 14c. "of the world of nature (especially as opposed to man)," from Old French naturel "of nature, conforming to nature; by birth," and directly from Latin naturalis "by birth, according to nature," from natura "nature" (see nature).

Of events, features, etc., "existing in nature as a result of natural forces" (that is, not caused by accident, human agency, or divine intervention), late 14c. From late 14c. of properties, traits, qualities, "proper, suitable, appropriate to character or constitution;"  from late 15c. as "native, native-born." Also late 15c. as "not miraculous, in conformity with nature," hence "easy, free from affectation" (c. 1600). Of objects or substances, "not artificially cultivated or created, existing in nature" c. 1400. As a euphemism for "illegitimate, bastard" (of children), it is recorded from c. 1400, on the notion of blood kinship (but not legal status).

Natural science, that pertaining to physical nature, is from late 14c.;  natural history meaning more or less the same thing is from 1560s (see history).  Natural law "the expression of right reason or the dictate of religion inhering in nature and man and having ethically binding force as a rule of civil conduct" is from late 14c. Natural order "apparent order in nature" is from 1690s. Natural childbirth is attested by 1898. Natural life, usually in reference to the duration of life, is from mid-15c.; natural death, one without violence or accident, is from mid-15c. To die of natural causes is from 1570s.

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natural-born (adj.)

"so by nature, born so," 1580s, from natural (adj.) + born.

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kraal (n.)
"village, pen, enclosure," 1731, South African, from colonial Dutch kraal, from Portuguese curral "pen or enclosure for animals" (see corral (n.)).
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inclosure (n.)
variant of enclosure preserved in some legal uses. Related: Inclosure.
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courtyard (n.)

"enclosure around or adjacent to a house," 1550s, from court (n.) + yard (n.1).

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casing (n.)
1570s, "action of fitting with a case," verbal noun from case (v.). Meaning "a covering, an enclosure" is from 1839.
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haw (n.)
"enclosure," Old English haga "enclosure, fortified enclosure; hedge," from Proto-Germanic *hag- (source also of Old Norse hagi, Old Saxon hago, German Hag "hedge;" Middle Dutch hage, Dutch haag, as in the city name The Hague), from PIE root *kagh- "to catch seize; wickerwork fence" (see hedge (n.), and compare hag). Meaning "fruit of the hawthorn bush" (Old English) is perhaps short for *hægberie.
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paddock (n.2)

"a small field or enclosure," 1620s, apparently an alteration of Middle English parrock, from Old English pearroc "enclosed space, fence" (see park (n.)). Or possibly from Medieval Latin parricus (8c.), which ultimately is from Germanic. Especially a small pastured enclosure near a stable.

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