demonstration
From LSJ
subs.
Proof sign: P. and V. σημεῖον, τό, τεκμήριον, τό, δείγμα, τό, P. ἔνδειγμα, τό.
Showing: P. ἀπόδειξις, ἡ.
Display, show: Ar. and P. ἐπίδειξις, ἡ.
Test: P. and V. ἔλεγχος, ὁ.
Make a (naval or military) demonstration: P. ἐπίδειξιν ποιεῖσθαι (Thuc. 3, 16).