A place or policy of employment that does not permit discrimination against employees based on membership or nonmembership in a labor union.
A factory, business, etc. employing workers without regard to whether or not they are members of a union with which it may have a contract; also, the policy of employing workers in this way.
A business that employs workers regardless of whether or not they are members of a labor union.
A place of employment in which employment is in no way conditioned on membership in a union, though a union may be the exclusive bargaining agent of the employees.