Noun
fuzzy set (plural fuzzy sets)
(fuzzy set theory, fuzzy logic) A set whose elements have degrees of membership, instead of only full and empty membership.
Fuzzy set theory main In set theory as Cantor defined and Zermelo and Fraenkel axiomatized, an object is either a member of a set or not. Source: Internet
Soft Computing (Allied Publishers 2005) (page 73) Example Hard science with IF-THEN rules Fuzzy set theory defines fuzzy operators on fuzzy sets. Source: Internet