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.
Wiktionary(1.00 / 1 vote)Rate this definition: 1  open(Noun) A sports event in which anybody can contest; as, the Australian Open. 2  open(Noun) a wire that is broken midway. The electrician found the open in the circuit after a few minutes of testing. 3  open(Noun) (with the) Open or unobstructed space; an exposed location.