telesterion en · NOUN
Etymology
From Ancient Greek τελεστήριον (telestḗrion, “initiation hall”), from τελείω (teleíō, “to initiate”).
Meanings
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A building used to celebrate sacred rites in Ancient Greece.
With each successive telesterion, the structure grew in size and capacity, an expansion that indicates the growing and continued popularity of the cult […]
2016, Margaret M. Miles, A Companion to Greek Architecture, John Wiley & Sons, →ISBN, page 183:Central among them is what, to avoid controversy, it is convenient to call the telesterion: a building designed to accommodate the faithful inside, and thus unique among the forms of Greek sacred architecture.
2005, Robert Parker, Polytheism and Society at Athens, Oxford University Press, →ISBN, page 351: