open set
noun maths
a set which is not a closed set
an interval on the real line excluding its end points, as [0, 1], the set of reals between, but excluding, 0 and 1
Words nearby open set
open season,
open season on,
open secret,
open sentence,
open sesame,
open set,
open shop,
open side,
open sight,
open slather,
open source