More fully (with the addition of 'and a mountain in Macedonia') in other lexica; references at Photius omicron255 Theodoridis.
'The highest mountain [2918 m.] in the Greek peninsula, dominating the Aegean to the east and, to the north and south, the Macedonian and Thessalian plains... Considered to be the throne of Zeus and home of the gods, it held an important place in religion, mythology, and literature' OCD(4) s.v. Olympus(1).