keyness noun2 •The degree to which something is key, or important.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. — 1973 •The statistical significance of a keyword's frequency in a given corpus, relative to a reference corpus.This was one of the weakest keywords that was found, with a keyness of 24.9. — 2005