1. Inhabitants or natives of an isthmus, particularly the Isthmus of Corinth in ancient Greece.
Usage: Often capitalized when referring to ancient Greek peoples; Historical/geographical term
2. Participants in or winners of the Isthmian Games, ancient Greek athletic competitions held on the Isthmus of Corinth.
Usage: Historical context; Often capitalized

Examples

• The Isthmians were known for their control of trade routes between northern and southern Greece.
• Ancient Isthmians competed in wrestling, running, and other athletic events.
• The Isthmian Games attracted athletes from across the Greek world.
• Isthmians built temples and monuments to honor their gods.
• Historical records describe the Isthmians as skilled merchants and sailors.