When the Old Testament was translated into the Greek a few hundred years before Christ, ekklesia was used to translate the Hebrew word “qahal” which means assembly or congregation. So an ekklesia was a gathering of people with a shared belief, a common identity. In the New Testament, the early believers used this word for their church gatherings and it stuck.
ekklesia is a derivative of the root words “ek kaleo” which literally means to be called out. So simultaneously, ekklesia implies that we gather and scatter.
However you use ekklesia it NEVER describes something you do or somewhere that you go … but it ALWAYS describes something that we ARE…together.