Â©Copyright 2004 - 2015 Meaning-of-Names.com-Powered by Swigity, LLC Meaning of Niemann Last Name-Surname-Family Name Niemann.Copyright 2004 - 2015 Meaning-of-Names.com-Powered by Swigity, LLC Meaning of Niemann Last Name-Surname-Family Name Niemann.
open - of a set; containing points whose neighborhood consists of other points of the same set, or being the complement of an open set; of an interval; containing neither of its end points.
Definition of open house for English Language Learners. : 1  an event in which an organization (such as a school or company) invites the public to visit in order to see the things that happen there. : 2  an event in which anyone who is interested in buying a particular house, apartment, etc., is invited to go inside and look at it.