noon

[noon]
noun
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:
before 900; Middle English none, Old English nōn < Latin nōna ninth hour. See none2

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World English Dictionary
noon (nuːn)
 
n
1.  a.  the middle of the day; 12 o'clock in the daytime or the time or point at which the sun crosses the local meridian
 b.  (as modifier): the noon sun
2.  poetic the highest, brightest, or most important part; culmination
 
[Old English nōn, from Latin nōna (hōra) ninth hour (originally 3 p.m., the ninth hour from sunrise)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

noon
1140, non "midday, 12 o'clock p.m., midday meal," from O.E. non "3 o'clock p.m.," also "the canonical hour of nones," from L. nona hora "ninth hour" of daylight, by Roman reckoning about 3 p.m., from nona, fem. sing. of nonus "ninth" (see nones). Meaning 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 Du. noen). Noonday was first used by Coverdale (1535).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The topiary artist will be creating living works of art at noon and again at
  three that day.
Sundays are also a big meal day, with formal settings at noon.
For example, after you had a night shift, you were probably sleeping till next
  noon.
Most photographs are taken near noon with the sun out, on clear days.
Synonyms
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