Strong's Concordance

Original word: μαντεύομαι
Transliteration: manteuomai
Definition (short): fortune-telling
Definition (full): to divine

NAS Exhaustive Concordance

Word Origin: from mantis (a seer)
Definition: to divine
NASB Translation: fortune-telling (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a derivative of mainomai (meaning a prophet, as supposed to rave through inspiration); to divine, i.e. Utter spells (under pretense of foretelling -- by soothsaying.

see GREEK mainomai

KJV: And it came to pass, as we went to prayer, a certain damsel possessed with a spirit of divination met us, which brought her masters much gain by soothsaying:
NASB: It happened that as we were going to the place of prayer, a slave-girl having a spirit of divination met us, who was bringing her masters much profit by fortune-telling.