/ nuːn; NAmE / noun
[ U ] 12 o'clock in the middle of the day
SYN midday :
We should be there by noon.
The conference opens at 12 noon on Saturday.
the noon deadline for the end of hostilities
I'm leaving on the noon train.
the glaring light of high noon
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IDIOMS
see morning
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WORD ORIGIN
Old English nōn the ninth hour from sunrise, i.e. approximately 3 p.m. , from Latin nona (hora) ninth hour.