G0198–ἀκριβόω–akriboō

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

ἠκρίβωσεν ēkribōsen “inquired exactly”

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

ἠκρίβωσεν ēkribōsen “he had ascertained”