Etymology
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unit (n.)
1560s, "single number regarded as an undivided whole," alteration of unity on the basis of digit. Popularized in John Dee's English translation of Euclid, to express Greek monas (Dee says unity formerly was used in this sense). Meaning "single thing regarded as a member of a group" is attested from 1640s. Extended sense of "a quantity adopted as a standard of measure" is from 1738. Sense of "group of wards in a hospital" is attested from 1893.
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area (n.)

1530s, "vacant piece of ground," from Latin area "level ground, open space," used of building sites, playgrounds, threshing floors, etc.; which is of uncertain origin. Perhaps an irregular derivation from arere "to become dry" (see arid), on notion of "bare space cleared by burning." The generic sense of "any particular amount of surface (whether open or not) contained within any set of limits" is from 1560s. Area code in the North American telephone systems is attested from 1959.

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are (n.)
metric unit of square measure, 10 meters on each side (100 square meters), 1819, from French, formed 1795 by decree of the French National Convention, from Latin area "vacant piece of ground" (see area).
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ranger (n.)

late 14c. (early 14c. in surnames), "gamekeeper, sworn officer of a forest whose work is to walk through it and protect it," agent noun from range (v.). Attested from 1590s in the general sense of "a rover, a wanderer;" from 1660s in the sense of "man (often mounted) who polices an area." The elite U.S. combat unit is so called from 1942 (organized 1941).

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Krugerrand (n.)
also Kruger rand, 1967, South African gold coin (issued for investment purposes) bearing a portrait of Transvaal President Stephanus Johannes Paulus Kruger (1825-1904); second element is rand, unit of decimal currency introduced in Republic of South Africa 1961, named for The Rand, gold-mining area in Transvaal, short for Witwatersrand (see rand).
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areal (adj.)
"pertaining to an area," 1670s, from Latin arealis, from area "level ground, open space" (see area).
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photon (n.)

"unit of electromagnetic radiation," 1926, from photo- "light" + -on "unit." Related: Photonic.

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areola (n.)

"colored circle around a nipple" (areola papillaris), 1706, from Latin areola, literally "small area," diminutive of area (see area). Introduced in this sense 1605 by Swiss anatomist and botanist Caspar Bauhin. The word also is used in other anatomical senses. Related: Areolar.

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unitary (adj.)
1847, "characterized by unity or uniformity;" 1865, "of or relating to a unit;" see unit + -ary.
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