Usually means: Matrix with three diagonal bands.
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We found 4 dictionaries that define the word tridiagonal:

General (2 matching dictionaries)
  1. tridiagonal: Wiktionary
  2. Tridiagonal: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Tridiagonal: Encyclopedia

Science (1 matching dictionary)
  1. tridiagonal: PlanetMath Encyclopedia

Definitions from Wiktionary (tridiagonal)

adjective:  (linear algebra, of a matrix) Having nonzero elements only in the main diagonal and the diagonals directly above and below it

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