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- (anthropology) The degree to which something is key, or important.
- 1973, Sherry B. Ortner, “On Key Symbols”, in American Anthropology, volume 75:
- The keyness of a summarizing symbol derives from the relative fundamentality (or ultimacy) of the meanings which it formulates, relative to other meanings of the system.
- (computational linguistics) The statistical significance of a keyword's frequency in a given corpus, relative to a reference corpus.