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While the concept of public space is frequently referenced, its definition is ambiguous. Current studies have attempted to clarify the definitions of public space. However, the supposed definitions of public space are usually contradictory upon further inspection. This article argues that epistemological assumptions are the main reason for these logical problems. The entity view, the preference for a real definition, and the concentration on “space in plan” should be changed. Inspired by Wittgenstein’s epistemology, this article proposes a framework for defining public space, which will help administrators flexibly and consistently identify the public nature of diverse semipublic spaces.