G1231–διαγινώσκω–diaginōskō

now, therefore, ye, signify ye to the chief captain, with the sanhedrim, that to-morrow he may bring him down unto you, as being about to know more exactly the things concerning him; and we, before his coming nigh, are ready to put him to death.'

διαγινώσκειν diaginōskein “to examine”

And having heard these things, Felix delayed them -- having known more exactly of the things concerning the way -- saying, `When Lysias the chief captain may come down, I will know fully the things concerning you;'

διαγνώσομαι diagnōsomai “I will examine”