See: Thomas Postlewait & Tracy C. Davis, ‘Theatricality: an introduction’, in Tracy C. Davis & Thomas Postlewait (eds.), Theatricality, Cambridge, 2003, pp. 1-39 (esp. 2).
I shall interpret theatricality primarily as ‘the quality of attracting (above-average) attention from the audience.’ -- Steenbrugge, Charlotte. "Theatricality." Ludus: Medieval & Early Renaissance Theatre & Drama, vol. 13, Jan. 2014, pp. 88-155.
Cardullo, Robert J. "Bertolt Brecht: The Naturalist, the Theatricalist, and the Dramatist-As-Director." Neohelicon, vol. 40, no. 2, Dec. 2013, pp. 637-653. doi:10.1007/s11059-012-0157-6.