G0198–ἀκριβόω–akriboō

Then Herod, having secretly called the magi, inquired of them accurately the time of the star that was appearing;

ἠκρίβωσεν ēkribōsen “inquired exactly”

Then Herod, seeing that he had been mocked by the magi, was greatly enraged; and sent and slew all the boys which [ergänzt: were] in Bethlehem, and in all its borders, from two years and under, according to the time which he had accurately inquired from the magi.

ἠκρίβωσεν ēkribōsen “he had ascertained”