Lexical Definition

‎ὀπτασία‎ optasía (op-tas-ee'-ah) vision ^G:N-F
from a presumed derivative of ‎ὀπτάνομαι‎

vision.

• visuality, i.e. (concretely) an apparition

Abbott-Smith

† ὀπτασία, -ας, ἡ (< ὀπτάζομαι, Nu 14:14* = ὀπτάνομαι), later form of ὄψις, [in LXX: Ma 3:2 (ראה ni.), Da TH 9:23 10:1, 7, 8, 16 (מַרְאֶה, מַרְאָה; LXX, ὅραμα, -σις), Es 4:7, Si 43:2, 16*;]
1. an appearing, coming into view (Ma 3:2, Es 4:7, Si 43:2, 16).
2. a vision: Lk 1:22 24:23, Ac 26:19, II Co 12:1 (Da 9:23 10:1, 7, 8, 16, also in MGr.).†

Abbott-Smith References

Liddell-Scott-Jones

ὀπτασία, ἡ

__A, (ὀπτάζομαι) vision, [Refs 4th c.BC+]; see at {ὁπλισία}), [LXX+NT]; simply, appearance, [LXX]

_{LSJ Scripture Refs: LXX.Esth.4.17 ☩ Luke.1.22 ☩ LXX.Mal.3.2}