Ecclesia

"Ecclesia means called out to govern." — Justin Paul Abraham
The Greek word "ecclesia" is correctly defined as: "The called-out (ones)" [ecc = out; kaleo = call]. Thus, you can see how this word was used to indicate a civil body of select (called, elected) people.
In the New Testament, "ecclesia" (signifying convocation) is the only single word used for church. It (ecclesia) was the name given to the governmental assembly of the city of Athens, duly convoked (called out) by proper officers and possessing all political power including even juridical functions.
The word in the New Testament was also used to refer to any assembly of people. In his address to the Sanhedrin, Stephen calls the people of Israel “the assembly [ekklesia] in the wilderness” (Acts 7:38). 
Thus, two of the most prestigious word resources in the English language confirm the fact that an "ecclesia" was originally a select civil body, summoned or convoked for a particular purpose. What, then, did the writers of the New Testament mean when they used the word "ecclesia" to describe a Christian body of people? We can assume that they intended to convey the original Greek meaning of the word: a body of Christians called out of the Roman and Judean system to come together into a separate civil community. 
See ECCO.