1: ὅραμα
(Strong's #3705 — Noun Neuter — horama — hor'-am-ah )

"that which is seen" (horao), denotes (a) "a spectacle, sight," Matthew 17:9; Acts 7:31 ("sight"); (b) "an appearance, vision," Acts 9:10 (ver. 12 in some mss.); 10:3,17,19; 11:5; 12:9; 16:9,10; 18:9.

2: ὅρασις
(Strong's #3706 — Noun Feminine — horasis — hor'-as-is )

"sense of sight," is rendered "visions" in Acts 2:17; Revelation 9:17 . See LOOK , B.

3: ὀπτασία
(Strong's #3701 — Noun Feminine — optasia — op-tas-ee'-ah )

(a late form of opsis, "the act of seeing"), from optano, "to see, a coming into view," denotes a "vision" in Luke 1:22; 24:23; Acts 26:19; 2—Corinthians 12:1 .