G3701–ὀπτασία–optasia

But when he came out he could not speak to them, and they recognised that he had seen a vision in the temple. And he was making signs to them, and continued dumb.

ὀπτασίαν optasian “a vision”

and, not having found his body, came, saying that they also had seen a vision of angels, who say that he is living.

ὀπτασίαν optasian “a vision”

Whereupon, king Agrippa, I was not disobedient to the heavenly vision;

ὀπτασίᾳ, optasia “vision,”

Well, it is not of profit to me to boast, for I will come to visions and revelations of [ergänzt: the] Lord.

ὀπτασίας optasias “visions”