Greek

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 Israel.

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").