Strong's #1577: ekklesia (pronounced ek-klay-see'-ah)
 from a compound of 1537 and a derivative of 2564; a calling out, i.e. (concretely) a popular meeting, especially a religious congregation (Jewish synagogue, or Christian community of members on earth or saints in heaven or both):--assembly, church.
Thayer's Greek Lexicon:
 ̓́ 
 
  ekklēsia 
 
 1) a gathering of citizens called out from their homes into some public place, an assembly
 
 1a) an assembly of the people convened at the public place of the council for the purpose of deliberating
 1b) the assembly of the Israelites
 1c) any gathering or throng of men assembled by chance, tumultuously
 1d) in a Christian sense
 
 1d1) an assembly of Christians gathered for worship in a religious meeting
 1d2) a company of Christian, or of those who, hoping for eternal salvation through Jesus Christ, observe their own religious rites, hold their own religious meetings, and manage their own affairs, according to regulations prescribed for the body for order' s sake
 1d3) those who anywhere, in a city, village, constitute such a company and are united into one body
 1d4) the whole body of Christians scattered throughout the earth
 1d5) the assembly of faithful Christians already dead and received into heaven
 
  Part of Speech: noun feminine
Relation: from a compound of G1537 and a derivative of G2564
  Citing in TDNT: 3:501, 394
 
Usage:
This word is used 116 times:
Matthew 16:18: "this rock I will build my  church; and the gates of hell"
Matthew 18:17: "them, tell it unto the  church: but if he neglect to hear the"
Matthew 18:17: "if he neglect to hear the  church, let him be unto thee as a heathen man"
Acts 2:47: "Lord added to the  church daily such as should be saved."
Acts 5:11: "upon all the  church, and upon as many as heard"
Acts 7:38: "he, that was in the  church in the wilderness with"
Acts 8:1: "persecution against the  church which was at Jerusalem; and"
Acts 8:3: "Saul, he made havoc of the  church, entering into every house, and"
Acts 9:31: "had the  churches rest throughout all Judea"
Acts 11:22: "tidings of these things came unto the ears of the  church which"
Acts 11:26: "assembled themselves with the  church, and taught much"
Acts 12:1: "certain of the  church."
Acts 12:5: "without ceasing of the  church unto"
Acts 12:5: "without ceasing of the  church unto"
Acts 13:1: "there were in the  church that was at Antioch certain"
Acts 14:23: "when they had ordained them elders  in every church, and had prayed with fasting,"
Acts 14:27: "And when they were come, and  had gathered the church together, they rehearsed all that"
Acts 15:3: "brought on their way by the  church, they passed through Phoenicia and"
Acts 15:4: "they were received of the  church, and of the apostles and"
Acts 15:22: "with the whole  church, to send chosen men of"
Acts 15:41: "Cilicia, confirming the  churches."
Acts 16:5: "And so were the  churches established in the faith, and"
Acts 18:22: "and saluted the  church, he went down to Antioch."
Acts 19:32: "Some therefore cried one thing, and some another: for the  assembly was"
Acts 19:39: "it shall be determined in a lawful  assembly."
Acts 19:41: "spoken, he dismissed the  assembly."
Acts 20:17: "the elders of the  church."
Acts 20:28: "overseers, to feed the  church of God, which he hath purchased with"
Romans 16:1: "which is a servant of the  church which is at Cenchrea:"
Romans 16:4: "also all the  churches of the Gentiles."
Romans 16:5: "Likewise greet the  church that is in their house. Salute my"
Romans 16:16: "a holy kiss. The  churches of Christ salute you."
Romans 16:23: "and of the whole  church, saluteth you. Erastus the"
1 Corinthians 1:2: "Unto the  church of God which is at Corinth, to them that are sanctified in"
1 Corinthians 4:17: "as I teach every where in every  church."
1 Corinthians 6:4: "to judge who are least esteemed in the  church."
1 Corinthians 7:17: "ordain I in all  churches."
1 Corinthians 10:32: "nor to the Gentiles, nor to the  church of God:"
1 Corinthians 11:16: "custom, neither the  churches of God."
1 Corinthians 11:18: "come together in the  church, I hear that there be divisions among"
1 Corinthians 11:22: "to drink in? or despise ye the  church of God, and shame"
1 Corinthians 12:28: "some in the  church, first apostles, secondarily"
1 Corinthians 14:4: "but he that prophesieth edifieth  the church."
1 Corinthians 14:5: "except he interpret, that the  church may receive edifying."
1 Corinthians 14:12: "the edifying of the  church."
1 Corinthians 14:19: "Yet in  the church I had rather speak five words with"
1 Corinthians 14:23: "therefore the whole  church be come together into one place, and"
1 Corinthians 14:28: "interpreter, let him keep silence in  the church; and let him speak to himself, and"
1 Corinthians 14:33: "as in all  churches of the saints."
1 Corinthians 14:34: "keep silence in the  churches: for it is not permitted unto them"