Webster's English Dictionary

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noon

noon \'nu:n\ n [ME, fr. OE no-n ninth hour from sunrise, fr. L nona, fr. 
   fem. o] often attrib f nonus ninth; akin to L novem nine - more at NINE 1: 
   the middle of the day : MIDDAY  2: MIDNIGHT - used chiefly in the phrase 
   noon of night  3: the highest point