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We found 3 dictionaries that define the word subdiagonal:

General (2 matching dictionaries)
  1. subdiagonal: Wiktionary
  2. Subdiagonal: Wikipedia, the Free Encyclopedia

Science (1 matching dictionary)
  1. Subdiagonal: Eric Weisstein's World of Mathematics

Definitions from Wiktionary (subdiagonal)

adjective:  (mathematics) Said of an entry of a square matrix: that it lies anywhere in the lower triangular area below the main diagonal of the matrix.
noun:  (mathematics) The diagonal of a matrix that lies directly below and to the left of the main diagonal.

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