confirm
From LSJ
English > Greek (Woodhouse)
v. trans.
make a thing sure: P. βεβαιοῦν.
verify: P. ἐπαληθεύειν.
ratify: P. and V. κυροῦν, ἐπικυροῦν, ἐμπεδοῦν (Plat., also Ar.).
encourage: P. and V. θρασύνειν, θαρσύνειν, P. ἐπιρρωνύναι; see encourage.