G0198–ἀκριβόω–akriboō

Then Herod, when he had privately called the wise men, inquired of them diligently what time the star appeared.

ἠκρίβωσεν ēkribōsen “inquired exactly”

Then Herod, when he saw that he was mocked by the wise men, was exceeding wroth, and sent forth, and slew all the children that were in Bethlehem, and in all its borders, from two years old and under, according to the time which he had diligently inquired of the wise men.

ἠκρίβωσεν ēkribōsen “he had ascertained”