c. 1300 (n.) "native or inhabitant of ancient Macedonia," from Latin Macedonius (see Macedonia) + -an. From 1580s as an adjective, "belonging or relating to ancient Macedonia." The people of Alexander the Great; they used a Greek language and were akin to the Greeks, and in Lower Macedonia, especially along the coasts where the two peoples were in contact, they were largely Hellenized, but in classical times among the Greeks (who were sensitive about identity) seem to have been generally considered foreigners, though not barbarians, due to the important differences, such as government by monarchy.

Others are reading

Definitions of Macedonian from WordNet
Macedonian (n.)
a native or inhabitant of Macedon;
Macedonian (n.)
the Slavic language of modern Macedonia;
Macedonian (adj.)
of or relating to Macedonia or its inhabitants;