FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

epistamai ἐπίσταμαι — ep-is'-tam-ahee — apparently a middle voice of 2186 (with 3563 implied); to put the mind upon, i.e. comprehend, or be acquainted with:--know, understand.

see GREEK for 2186

see GREEK for 3563