Vine's Expository Dictionary of NT Words
"a theater," was used also as "a place of assembly," Acts 19:29,31; in 1 Corinthians 4:9 it is used of "a show" or "spectacle." See SPECTACLE.
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Vines, W. E., M. A. Entry for 'Theater'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/t/theater.html. 1940.