Magic-square definitions

A square that contains numbers arranged in equal rows and columns such that the sum of each row, column, and sometimes diagonal is the same.
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A similar square containing letters in particular arrangements that spell out the same word or words.
noun
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A square table with a numeral in each cell, so devised that the sums of the numerals in each column, row, or main diagonal are always equal.
noun
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A square that contains numbers arranged in equal rows and columns such that the sum of each row, column, and sometimes diagonal is the same.
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(games) A palindromic square word arrangement, usually in the form of a magic amulet.

Probably the best-known magic square is the 5×5 square consisting of the words ROTAS OPERA TENET AREPO SATOR.

noun
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An n-by-n arrangement of n2 numbers such that the numbers in each row, in each column and along both diagonals all have the same sum.
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