Etymology
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untouched (adj.)
late 14c., "not been physically contacted," from un- (1) "not" + past participle of touch (v.). Meaning "unharmed, uninjured" is from c. 1400; that of "not used at all" is from 1530s; sense of "unmoved emotionally" is from 1610s.
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intact (adj.)
mid-15c., from Latin intactus "untouched, uninjured; undefiled, chaste; unsubdued," from in- "not" (see in- (1)) + tactus, past participle of tangere "to touch," from PIE root *tag- "to touch, handle."
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aphotic (adj.)

"untouched by sunlight, lightless" (in reference to deep-sea regions), 1894, Modern Latin, from Greek a- "not, without" (see a- (3)) + phōs (genitive phōtos) "light" (from PIE root *bha- (1) "to shine") + -ic. Aphotic zone is recorded from 1913.

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unaffected (adj.)
1580s, "not influenced, untouched in mind or feeling," from un- (1) "not" + past participle of affect (v.). Meaning "not adopted or assumed, genuine" is recorded from 1590s; that of "not acted upon or altered (by something)" is first attested 1830. Related: Unaffectedly; unaffectedness.
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integer (n.)

"a whole number" (as opposed to a fraction), 1570s, from noun use of Latin integer (adj.) "intact, whole, complete," figuratively, "untainted, upright," literally "untouched," from in- "not" (see in- (1)) + root of tangere "to touch" (from PIE root *tag- "to touch, handle"). The word was used earlier in English as an adjective in the Latin sense, "whole, entire" (c. 1500).

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integrate (v.)
1630s, "to render (something) whole, bring together the parts of," from Latin integratus, past participle of integrare "make whole," from integer "whole, complete," figuratively, "untainted, upright," literally "untouched," from in- "not" (see in- (1)) + root of tangere "to touch," from PIE root *tag- "to touch, handle."

The meaning "put together parts or elements and combine them into a whole" is from 1802. The "racially desegregate" sense (1940) probably is a back-formation from integration. Related: Integrated; integrating.
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pristine (adj.)

1530s, "pertaining to the earliest period, of a primitive style, ancient," from French pristin and directly from Latin pristinus "former, early, original," from Old Latin pri "before," from PIE root *per- (1) "forward," hence "in front of, before, first." Meaning "unspoiled, untouched, pure" is from 1899 (implied in a use of pristinely) is extended from such expressions as pristine wilderness, but according to OED [2nd ed. print], this is regarded as ignorant "by many educated speakers."

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relict (n.)

"a widow," mid-15c., relicte, etymologically "one who is left, one who remains," from Old French relict, fem. relicte, "person or thing left behind" (especially a widow) and directly from Medieval Latin relicta "a widow," noun use of fem. of relictus "abandoned, left behind," past-participle adjective from Latin relinquere "leave behind, forsake, abandon, give up," from re- "back" (see re-) + linquere "to leave" (from PIE *linkw-, nasalized form of root *leikw- "to leave").

In later only a semi-legal or formal term (perhaps from confusion with relic), "more often seen than heard" [Fowler]. Also as an adjective in Middle English and early modern English, originally "left undisturbed or untouched, allowed to remain" (mid-15c.) but used in various senses.

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nature (n.)

late 13c., "restorative powers of the body, bodily processes; powers of growth;" from Old French nature "nature, being, principle of life; character, essence," from Latin natura "course of things; natural character, constitution, quality; the universe," literally "birth," from natus "born," past participle of nasci "to be born," from PIE root *gene- "give birth, beget."

By mid-14c. as "the forces or processes of the material world; that which produces living things and maintains order." From late 14c. as "creation, the universe;" also "heredity, birth, hereditary circumstance; essential qualities, inherent constitution, innate disposition" (as in human nature); also "nature personified, Mother Nature." Nature and nurture have been paired and contrasted since Shakespeare's "Tempest."

The phrase "nature and nurture" is a convenient jingle of words, for it separates under two distinct heads the innumerable elements of which personality is composed. Nature is all that a man brings with himself into the world; nurture is every influence from without that affects him after his birth. [Francis Galton, "English Men of Science: Their Nature and Nurture," 1875]

Specifically as "the material world beyond human civilization or society; an original, wild, undomesticated condition" from 1660s, especially in state of nature "the condition of man before organized society." Nature-worship "religion which deifies the phenomena of physical nature" is by 1840.

Nature should be avoided in such vague expressions as 'a lover of nature,' 'poems about nature.' Unless more specific statements follow, the reader cannot tell whether the poems have to do with natural scenery, rural life, the sunset, the untouched wilderness, or the habits of squirrels. [Strunk & White, "The Elements of Style," 3rd ed., 1979]
Man, her last work, who seem'd so fair,
Such splendid purpose in his eyes,
Who roll'd the psalm to wintry skies,
Who built him fanes of fruitless prayer,
Who trusted God was love indeed
And love Creation's final law—
Tho' Nature, red in tooth and claw
With ravine, shriek'd against his creed—
[Tennyson, from "In Memoriam"]
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