Jaccard index

noun

A statistic for gauging the similarity and diversity of sample sets, based on the size of the intersection between the sets divided by the size of the union of the sets.

Similar
Jaccard coefficient
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Meanings

nounJaccard index (plural Jaccard indexes or Jaccard indices)

plural Jaccard indexes · plural Jaccard indices

  1. mathematicsA statistic for gauging the similarity and diversity of sample sets, based on the size of the intersection between the sets divided by the size of the union of the sets.

    Synonyms: Jaccard coefficient

Synonyms & antonyms

nounA statistic for gauging the similarity and diversity of sample sets, based on the size of the intersection between the sets divided by the size of the union of the sets.

Similar
Jaccard coefficient
Also see
jaccard coefficient

Origin

Developed by Swiss botanist Paul Jaccard (1868–1944), who gave it the French name coefficient de communauté.

Full word history & related roots →
Cite this entry
APA

Jaccard index. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/Jaccard%20index

MLA

“Jaccard index.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Jaccard%20index. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “Jaccard index,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/Jaccard%20index.

Source: Jaccard index on Wiktionary, CC BY-SA 4.0.