The term CITY-STATE, ANCIENT can be summarized by four different crossword solutions: INCA (4 letters), POLIS (5 letters), SPARTA (6 letters), CORINTH (7 letters), and SINGAPORE (9 letters). The INCA Empire was a South American civilization that flourished in the 15th and 16th centuries. Polis was an ancient Greek city-state, and SPARTA was a prominent city-state in ancient Greece. Corinth was another ancient Greek city-state, located on the Isthmus of Corinth. Singapore is a modern city-state in Southeast Asia.