http://biblesuite.com/greek/1577.htm
1577 ekklēsía(from 1537 /ek, "out from and to" and 2564 /kaléō, "to call") – properly, people called out from the world and to God, the outcome being the Church (the mystical body of Christ) – i.e. the universal (total) body of believers whom God calls out from the world and into His eternal kingdom.
[The English word "church" comes from the Greek word kyriakos, "belonging to the Lord" (kyrios). 1577 /ekklēsía ("church") is the root of the terms "ecclesiology" and "ecclesiastical."]
Word Origin: from ek and kaleó
Definition: an assembly, a (religious) congregation
While the word church normally means a building, some of the earliest Christians did meet in a building...
Act 2:46 And they, continuing daily with one accord in the temple, and breaking bread from house to house, did eat their meat with gladness and singleness of heart,
However, Jesus said He was the Temple...Jesus knew the church wasn't a physical building but a spiritual building...As we know, our church is spiritual, it's not physical...
It may be wrong to call our spiritual church a spiritual building but what I find interesting is that a bit of bible study is required to figure out that the word church references something spiritual and not a physical building...Yet, at the same time, we go to a physical building when we go to church...
Catholics and others don't spend much time in the scriptures so to them, a church is a physical building only...