Found only in the New Testament, where a distinction is observed between "Greek" and "Grecian" (q.v.). The former is (1) a Greek by race (Acts 16:1-3; 18:17; Rom. 1:14), or (2) a Gentile as opposed to a Jew (Rom. 2:9, 10). The latter, meaning properly "one who speaks Greek," is a foreign Jew opposed to a home Jew who dwelt in Palestine.
The word "Grecians" in Acts 11:20 should be "Greeks," denoting the heathen Greeks of that city, as rendered in the Revised Version according to the reading of the best manuscripts ("Hellenes").
Easton's Bible Dictionary. M.G. Easton. 1897.