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noon

[noon] /nun/
noun
1.
2.
twelve o'clock in the daytime.
3.
the highest, brightest, or finest point or part:
the noon of one's career.
4.
Archaic. midnight:
the noon of night.
Origin
900
before 900; Middle English none, Old English nōn < Latin nōna ninth hour. See none2
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for noons

noon

/nuːn/
noun
1.
  1. the middle of the day; 12 o'clock in the daytime or the time or point at which the sun crosses the local meridian
  2. (as modifier) the noon sun
2.
(poetic) the highest, brightest, or most important part; culmination
Word Origin
Old English nōn, from Latin nōna (hōra) ninth hour (originally 3 p.m., the ninth hour from sunrise)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for noons

noon

n.

mid-12c., non "midday, 12 o'clock p.m., midday meal," from Old English non "3 o'clock p.m., the ninth hour," also "the canonical hour of nones," from Latin nona hora "ninth hour" of daylight, by Roman reckoning about 3 p.m., from nona, fem. singular of nonus "ninth" (see nones). Sense shift from "3 p.m." to "12 p.m." began during 12c., when time of Church prayers shifted from ninth hour to sixth hour, or perhaps because the customary time of the midday meal shifted, or both. The shift was complete by 14c. (cf. same evolution in Dutch noen).

Online Etymology Dictionary, © 2010 Douglas Harper
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