
1) Classical study
Found on
https://www.crosswordclues.com/clue/synoecism

Synoecism or synecism (əm {respell|si|NEE|siz-əm}; συνοικισμóς, sunoikismos, anc), also spelled synoikism (əm {respell|si|NOY|kiz-əm}), was originally the amalgamation of villages in Ancient Greece into poleis, or city-states. Etymologically the word means `dwelling together (syn) in the same house (oikos).` Subsequently any act o.....
Found on
http://en.wikipedia.org/wiki/Synoecism

uniting of several towns under a single capital city
Found on
http://phrontistery.info/s.html
No exact match found.