G3701–ὀπτασία–optasia

And when he came out, he could not speak unto them: and they perceived that he had seen a vision in the temple: and he continued making signs unto them, and remained dumb.

ὀπτασίαν optasian “a vision”

and when they found not his body, they came, saying, that they had also seen a vision of angels, who said that he was alive.

ὀπτασίαν optasian “a vision”

Wherefore, O king Agrippa, I was not disobedient unto the heavenly vision:

ὀπτασίᾳ, optasia “vision,”

I must needs glory, though it is not expedient; but I will come to visions and revelations of the Lord.

ὀπτασίας optasias “visions”