Crossword Genius

Regular array (6)

Ross

I believe the answer is:

matrix

(Other definitions for matrix that I've seen before include "Grid-like array of rat mix" , "Rectangular array of quantities or symbols" , "Arrangement of numbers" , "Mathematical array; The --, sci-fi film" , "A maths array in rows and columns" .)

I've seen this clue in the King Feature Syndicate.
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