Noun
Used other than figuratively or idiomatically: see generic, property.
(mathematics, measure theory) A property that is true almost everywhere in a given set (i.e., the set of points at which the property is not true is either of measure zero or a subset of a set of measure zero).
(topology, algebraic geometry) A property that is true in some dense open subset of a given set.
Source: en.wiktionary.org