G0198–ἀκριβόω–akriboō

Then Herod secretly called the wise men, and learned from them exactly what time the star appeared.

ἠκρίβωσεν ēkribōsen “inquired exactly”

Then Herod, when he saw that he was mocked by the wise men, was exceedingly angry, and sent out, and killed all the male children who were in Bethlehem and in all the surrounding countryside, from two years old and under, according to the exact time which he had learned from the wise men.

ἠκρίβωσεν ēkribōsen “he had ascertained”