U.
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U.
abbreviation for
1. (Mathematics) maths union
2. unit
3. united
4. (Education) university
5. upper
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014