Lexical Definition

‎θέατρον‎ théatron (theh'-at-ron) theatre ^G:N-N
from ‎θεάομαι‎

spectacle, theatre.

• a place for public show ("theatre"), i.e. general audience-room
• by implication, a show itself (figuratively)

Abbott-Smith

* θέατρον, -ον, τό (< θεάομαι),
1. a theatre (used also as a place of assembly): Ac 19:29, 31.
2. Collective for οἱ θεαταί, the spectators.
3. = θέα, θέαμα, a spectacle, show: metaph., I Co 4:9.†

Abbott-Smith References

Liddell-Scott-Jones

θέατρον,

Ionic dialect θέητρον, τό, (θεάομαι) place for seeing, especiallyfor dramatic representation, theatre, [Refs 5th c.BC+]; as a place of assembly, [NT+5th c.BC+]; θ. κυνηγετικόν, of the Roman amphitheatre, [Refs 2nd c.AD+]; εἰς τὸ θ. εἰσφέρειν to bring upon the stage, [Refs 5th c.BC+]; τὸ καλὸν τοῦ θ. a good place in the theatre, [Refs 2nd c.AD+]

__2 collective for οἱ θεαταί, the spectators, 'the house', [Refs 5th c.BC+]
__3 ={θέαμα}, spectacle, θ. ἐγενήθημεν τῷ κόσμῳ [NT]
__4 metaphorically, of life, τουτὶ τὸ θ. ὑπεκρίθημεν [Refs 3rd c.AD+]

_{LSJ Scripture Refs: Acts.19.20 ☩ 1Cor.4.9}