trustworthy; adverbially

As (cf. ), , . adj. Is 65:16 Re 3:14 ὁ ἀ. As , adv. in solemn assent to the statements or prayers of another (, etc.): , ; Nu 5:22 Ne 5:13 8:6 I Co 14:16 ὁ ἀ. similarly, at the end of one's own prayer or ascription of praise: , , ; Ro 1:25 15:33 Ga 1:5 I Ti 1:17 in the Gospels, exclusively, introducing solemn statements of our Lord, , : , (v. Swete, in l.), , al.; , always in , al.; , , (on usage in , v. MM, , s.v.). truly verily Mt 5:18 26 Mk 3:28 Lk 4:24 Jo 1:52 3:3 5:19 II Co 1:20 ἀ. ἀ. τὸ ναί καὶ . . . τὸ ἀ. π. VGT

properly, firm, i.e. (figuratively) trustworthy; adverbially, surely (often as interjection, so be it)

amen, verily