Strong's #4864: sunagoge (pronounced soon-ag-o-gay')
 from (the reduplicated form of) 4863; an assemblage of persons; specially, a Jewish "synagogue" (the meeting or the place); by analogy, a Christian church:--assembly, congregation, synagogue.
Thayer's Greek Lexicon:
 ́ 
 
  sunagōgē 
 
 1) a bringing together, gathering (as of fruits), a contracting
 2) in the NT, an assembling together of men, an assembly of men
 3) a synagogue
 
 3a) an assembly of Jews formally gathered together to offer prayers and listen to the reading and expositions of the scriptures; assemblies of that sort were held every sabbath and feast day, afterwards also on the second and fifth days of every week; name transferred to an assembly of Christians formally gathered together for religious purposes
 3b) the buildings where those solemn Jewish assemblies are held. Synagogues seem to date their origin from the Babylonian exile. In the times of Jesus and the apostles every town, not only in Palestine, but also among the Gentiles if it contained a considerable number of Jewish inhabitants, had at least one synagogue, the larger towns several or even many. These were also used for trials and inflicting punishment.
 
  Part of Speech: noun feminine
Relation: from (the reduplicated form of) G4863
  Citing in TDNT: 7:798, 1108
 
Usage:
This word is used 57 times:
Matthew 4:23: "teaching in their  synagogues, and preaching the gospel"
Matthew 6:2: "do in the  synagogues and in the streets,"
Matthew 6:5: "standing in the  synagogues and in the corners"
Matthew 9:35: "teaching in their  synagogues, and preaching the gospel"
Matthew 10:17: "they will scourge you in their  synagogues;"
Matthew 12:9: "he went into their  synagogue:"
Matthew 13:54: "them in their  synagogue, insomuch that they were astonished, and"
Matthew 23:6: "chief seats in the  synagogues,"
Matthew 23:34: "them shall ye scourge in your  synagogues, and persecute them from"
Mark 1:21: "he entered into the  synagogue, and taught."
Mark 1:23: "there was in their  synagogue a man with an unclean spirit;"
Mark 1:29: "when they were come out of the  synagogue, they entered into the house"
Mark 1:39: "he preached in their  synagogues throughout all Galilee,"
Mark 3:1: "again into the  synagogue; and there was a man there"
Mark 6:2: "to teach in the  synagogue: and many hearing him were astonished,"
Mark 12:39: "the chief seats in the  synagogues, and the uppermost rooms at feasts:"
Mark 13:9: "to councils; and in  the synagogues ye shall be beaten: and ye shall be brought"
Luke 4:15: "taught in their  synagogues, being glorified of all."
Luke 4:16: "was, he went into the  synagogue on the sabbath day,"
Luke 4:20: "of all them that were in the  synagogue were fastened on him."
Luke 4:28: "all they in the  synagogue, when they heard these things, were filled with wrath,"
Luke 4:33: "And in the  synagogue there was a man, which had a spirit"
Luke 4:38: "he arose out of the  synagogue, and entered into Simon's house."
Luke 4:44: "he preached in the  synagogues of Galilee."
Luke 6:6: "entered into the  synagogue and taught: and there"
Luke 7:5: "he hath built us  a synagogue."
Luke 8:41: "was a ruler of the  synagogue: and he fell down at Jesus'"
Luke 11:43: "uppermost seats in the  synagogues, and greetings in the"
Luke 12:11: "you unto the  synagogues, and unto magistrates, and powers,"
Luke 13:10: "in one of the  synagogues on the sabbath."
Luke 20:46: "the highest seats in the  synagogues, and the chief rooms at feasts;"
Luke 21:12: "persecute you, delivering you up to  the synagogues, and into prisons, being brought before"
John 6:59: "These things said he in  the synagogue, as he taught in Capernaum."
John 18:20: "taught in the  synagogue, and in the temple,"
Acts 6:9: "certain of the  synagogue, which is called the synagogue of the Libertines, and Cyrenians,"
Acts 9:2: "Damascus to the  synagogues, that if he found any"
Acts 9:20: "Christ in the  synagogues, that he is the"
Acts 13:5: "of God in the  synagogues of the Jews: and they had"
Acts 13:14: "went into the  synagogue on the sabbath day, and sat down."
Acts 13:42: "were gone out of the  synagogue, the Gentiles besought that these"
Acts 13:43: "Now when the  congregation was broken up, many of the Jews and"
Acts 14:1: "both together into the  synagogue of the Jews, and"
Acts 15:21: "in every city them that preach him, being read in the  synagogues every"
Acts 17:1: "Thessalonica, where was  a synagogue of the Jews:"
Acts 17:10: "thither went into the  synagogue of the Jews."
Acts 17:17: "he in the  synagogue with the Jews, and with the"
Acts 18:4: "he reasoned in the  synagogue every sabbath, and"
Acts 18:7: "house joined hard to the  synagogue."
Acts 18:19: "he himself entered into the  synagogue, and reasoned with the Jews."
Acts 18:26: "to speak boldly in the  synagogue: whom when Aquila and"