During the classical period (5th-4th centuries B.C.), Greek culture reached its literary and artistic zenith/ Classical (or Attic) Greek was characterized by subtlety of syntax and expressive use of particles. As the city of Athens attained cultural and political control, the Attic dialect gained prestige. With the Macedonian conquests, Attic Greek, combined with influences from other dialects (especially Ionic), became the international language of the eastern Mediterranean area.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Biblical Languages by Larry Walker. Page 230-231)