The meaning of “ὀκτώ”

“And it came to pass about an eight days after these sayings, he took Peter and John and James, and went up into a mountain to pray.”

“And after eight days again his disciples were within, and Thomas with them: then came Jesus, the doors being shut, and stood in the midst, and said, Peace be unto you.”

“And there he found a certain man named Eneas, which had kept his bed eight years, and was sick of the palsy.”

“Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.”