Believers make up the body of Christ. When they assemble together, Christ says He is there in their midst.
http://biblos.com/1_corinthians/1-2.htm
English = church. Greek = ekklesia
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."]
No one denomination is the *church* or is the body of Christ. Individual members make it up.
1 Corinthians 12:27 Now you (Corinthian believers) are the body of Christ and individually members of it.
Close, but no cigar. The Greek ekklesia was a 600 year old term when used by the New Testament authors. It was the chief governing body of the Greek democratic city states. Its members were not volunteers or some casual assembly, it was a very structured assembly comprised of male combat veterans over the age of 20. It had in its power the right to hire and fire the city officials and administrators, the ability to try judges and were the only ones who could declare war or issue a death sentence.
The Greek word Ecclesia, means those who are called and is synonymous with the Latin Vocare (to call) and the English vocation. The word is used extensively throughout the Septuagint as the translation of the Hebrew Qahal.
Peace be with you