a square array of numbers, letters, etc., in which each item appears exactly once in each row and column: used in statistical analysis.
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British Dictionary definitions for Latin square
(in statistical analysis) one of a set of square arrays of n rows and columns, esp as used in statistics and studied in combinatorial analysis, built up from n different symbols so that no symbol occurs more than once in any row or column
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012