"Church" from the Oxford English Dictionary, definitions 4 and 5.
4. a. The community or whole body of Christ's faithful people collectively; all who are spiritually united to Christ as Head of the Church. More fully described as the Church Universal or Catholic.
(Sometimes its external organization, sometimes its spiritual nature, is chiefly considered.)
b. Church militant: the Church on earth considered as warring against the powers of evil. (Sometimes used jocularly in reference to actual warfare or polemics.) Church triumphant: the portion of the church which has overcome the world, and entered into glory.
c. Visible Church: the church as visibly consisting of its professed members upon earth; contrasted with the Church Invisible, or Mystical.
d. The church as a spiritual society separated from the world is often opposed to the world.
5. a. A particular organized Christian society, considered either as the only true representative, or as a distinct branch, of the Church universal, separated by peculiarities of doctrine, worship, or organization, or confined to limits territorial or historical: e.g. the primitive church, the Latin Ch., Greek Ch., Orthodox Ch., Gallican Ch., Nestorian Ch., Ancient British Ch., Anglo-Saxon Ch., Lutheran Ch., Reformed Ch., Waldensian Ch., Ch. of England (see b.), of Scotland, Free Ch. of Scotland, United Presbyterian Ch., American Episcopal Ch., Methodist Episcopal Ch., etc.
Which part of this are you objecting to?
This is what the OED has to say about the etymology of the word "church".
Church, earlier churche, cherche, is a phonetically-spelt normal representative of Middle English chirche, the regular representation of Old English circe; the fuller Old English cirice, cirice gave the early ME. variant chereche, chiriche... Old English cirice, circe, corresponds. to West Germanic kîrika, Old Saxon kirika, kerika (Middle Low German and Middle Dutch kerke, Dutch kerk, Low German kerke, karke, kark, with ar:-er:-ir); Old Frisian szereke, szurke, tzierka, tziurk; Old High German. chirihha...; also Old Norse kirkia, kyrkja, Swedish kyrka, Danish kirke (thence Finnish. kirkko, Esthonian. kirrik, kirk, kerk; also Old Prussian. kîrkis). Cf. also the Slavonic forms: Old Slavonic criky, 10th c., cruky fem., later crukuve, cirkovi...
The ulterior derivation has been keenly disputed. The Latin circus, and a Gothic word kêlikn tower, upper chamber (app. originally Gaulish) have both been proposed (the latter suggested by the Alemannic chîlihha), but are set aside as untenable; and there is now a general agreement among scholars in referring it to the Greek word κυριακον, properly adj. of the Lord, dominicum, dominical (from κυριος lord), which occurs, from the 3rd century at least, used substantively (sc. δωμα, or the like) = house of the Lord, as a name of the Christian house of worship. Of this the earliest cited instances are in the Apostolical Constitutions (II. 59)
The emphasis is mine. Would you mind producing your sources so I may look at them?