tridiagonal

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adjective

Having nonzero elements only in the main diagonal and the diagonals directly above and below it.

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Meanings

adjectivetridiagonal (not comparable)
  1. not comparablelinear algebraHaving nonzero elements only in the main diagonal and the diagonals directly above and below it.

    The following proposition shows a connection between negafibonacci numbers and the determinants of a family of tridiagonal matrices.

    2019 June 24, Juan Triana, “Negafibonacci Numbers via Matrices”, in Bulletin of TICMI, volume 23, number 1, →ISSN, archived from the original on 13 Jul 2019, Negafibonacci numbers as tridiagonal matrix determinants, page 3

Origin

From tri- + diagonal.

Full word history & related roots →
Cite this entry
APA

tridiagonal. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/tridiagonal

MLA

“tridiagonal.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/tridiagonal. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “tridiagonal,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/tridiagonal.

Source: tridiagonal on Wiktionary, CC BY-SA 4.0.