Webster's English Dictionary

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day

day \'da-\ n [ME, fr. OE dg; akin to OHG tag day] 1a: the time of 
   light between one night and the next  1b: DAYLIGHT  2a: the period of the 
   earth's rotation on its axis  2b: the time required by a celestial body to 
   turn once on its axis  3: the mean solar day of 24 hours beginning at mean 
   midnight  4: a specified day or date  5: a specified time or period : AGE  
   6: the conflict or contention of the day  7: the time established by usage 
   or law for work