Merriam-Webster Online defines the word liminal as: 1) of or relating to a sensory threshold, 2) barley perceptible, and 3) of, relating to, or being in an intermediate state, phase, or condition, i.e., in-between or transitional. This final definition pertains to Schechner's essay.
Schechner uses this term, and its various inflections, throughout his essay. Liminality is an important concept to understand, as Schechner sees it as present in various forms of theater, in anthropology, and in television news.
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