A church building, often simply called a church, is a building used for Christian religious activities, particularly for worship services. The term in its architectural sense is most often used by Christians to refer to their religious buildings, but it is sometimes used (by analogy) to refer to buildings of other religions. In traditional Christian architecture, the church is often arranged in the shape of a Christian cross. When viewed from plan view the longest part of a cross is represented by the aisle and the junction of the cross is located at the altar area.
Towers or domes are often added with the intention of directing the eye of the viewer towards the heavens and inspiring church visitors. Modern church buildings have a variety of architectural styles and layouts; many buildings that were designed for other purposes have now been converted for church use; and, similarly, many original church buildings have been put to other uses.
The earliest identified Christian church was a house church founded between 233 and 256. From the 11th through the 14th centuries, a wave of building of cathedrals and smaller parish churches occurred across Western Europe. A cathedral is a church, usually Roman Catholic, Anglican, Oriental Orthodox or Eastern Orthodox, housing the seat of a bishop.
In Greek, the adjective kyriak-ós/-ē/-ón means "belonging, or pertaining, to a Kyrios" ("Lord"), and the usage was adopted by early Christians of the Eastern Mediterranean with regard to anything pertaining to the Lord Jesus Christ: hence "Kyriakós oíkos" ("house of the Lord", church), "Kyriakē" ("[the day] of the Lord", i.e. Sunday), or "Kyriakē proseukhē" (the "Lord's Prayer").
In standard Greek usage, the older word "ecclesia" (ἐκκλησία, ekklesía, literally "assembly", "congregation", or the place where such a gathering occurs) was retained to signify both a specific edifice of Christian worship (a "church"), and the overall community of the faithful (the "Church"). This usage was also retained in Latin and the languages derived from Latin (e.g. French église, Italian chiesa, Spanish iglesia, Portuguese igreja, etc.), as well as in the Celtic languages (Welsh eglwys, Irish eaglais, Breton iliz, etc.) and in Turkish (kilise).
In the Germanic and some Slavic languages, the word kyriak-ós/-ē/-ón was adopted instead and derivatives formed thereof. In Old English the sequence of derivation started as "cirice" (Ki-ri-keh), then "churche" (kerke), and eventually "church" in its current pronunciation. German Kirche, Scots kirk, Russian церковь (tserkov), etc., are all similarly derived.
According to the New Testament, the earliest Christians did not build church buildings. Instead, they gathered in homes (Acts 17:5, 20:20, 1 Corinthians 16:19) or in Jewish worship places like the Second Temple or synagogues (Acts 2:46, 19:8). The earliest archeologically identified Christian church is a house church (domus ecclesiae), the Dura-Europos church, founded between 233 and 256. In the second half of the 3rd century CE, the first purpose-built halls for Christian worship (aula ecclesiae) began to be constructed. Although many of these were destroyed early in the next century during the Diocletianic Persecution, even larger and more elaborate church buildings began to appear during the reign of the Emperor Constantine the Great.
From the 11th through the 14th centuries, a wave of building of cathedrals and smaller parish churches occurred across Western Europe. In addition to being a place of worship, the cathedral or the parish church was used by the community in other ways. It could serve as a meeting place for guilds or a hall for banquets. Mystery plays were sometimes performed in cathedrals, and cathedrals might also be used for fairs. The church could be used as a place to thresh and store grain.
Between 1000 and 1200 AD the romanesque style became popular across Europe. While the name of the romanesque era refers to the tradition of roman architecture, it was actually a West- and Central European trend. Romanesque buildings appear rather bulky and compact. Typical features are circular arches, round or octagonal towers and cushion capitals on the pillars. In the early romanesque era, coffering on the ceiling was fashionable, while later in the same era, groined vault was more popular. The rooms became wider and the motivs of sculptures became more epic.
The Gothic style emerged around 1140 in Île-de-France and spread through all of Europe. The gothic buildings were less compact than they had been in the romanesque era and often contained symbolic and allegoric features. For the first time, pointed arches, rib vaults and and buttresses were used, with the result that massive walls were not longer needed to stabilise the building. Due to that advantage, the area of the windows became bigger, which resulted in a brighter and more friendly atmosphere inside the church. The nave became higher and so did the pillars and the church steeple. The amibition to test out the limits of the architectural possibilities resulted in the collapse of several towers. In Germany and the Netherlands, but also in Spain, it became popular to build hall churches, in which every vault has the same height.
Cathedrals were build in a very lavish way, as in the romanesque era. Examples for that are the Notre-Dame de Paris and the Notre-Dame de Reims in France, but also the San Francesco d’Assisi in Palermo, the Salisbury Cathedral and the Wool Church in Lavenham, England.
Many gothic churches contain features from the romanesque era. Some of the most well-known gothic churches stayed unfinished for hundreds of years, after the gothic style was not popular anymore. About half of the Cologne Cathedral was for example build in the 19th century. 
In the 15th and 16th century, the change in ethics and society due to the renaissance and the reformation also influenced the building of churches. The common style was much like the gothic style, but in a simplified way. The basilica was not the most popular type of church anymore, but instead hall churches were build. Typical features are columns and classical capitals. 
The baroque style was first used in Italy around 1575. From there it spread to the rest of Europe and to the european colonies. During the baroque era, the building industry increased heavily. Buildings, even churches, were used as indicators for wealth, authority and influence.The use of forms known from the renaissance were extremely exaggerated. Domes and capitals were decorated with moulding and the former stucco-sculptures were replaced by fresco paintings on the ceilings. For the first time, churches were seen as one connected work of art and consistent artistic concepts were developed. Instead of long buildings, more central-plan buildings were created. The sprawling decoration with floral ornamentation and mythological motives raised until about 1720 to the rococo era. 
A common architecture for churches is the shape of a cross (a long central rectangle, with side rectangles, and a rectangle in front for the altar space or sanctuary). These churches also often have a dome or other large vaulted space in the interior to represent or draw attention to the heavens. Other common shapes for churches include a circle, to represent eternity, or an octagon or similar star shape, to represent the church's bringing light to the world. Another common feature is the spire, a tall tower on the "west" end of the church or over the crossing.
Another common feature of many christian churches is the eastwards orientation of the front altar. Unlike the jewish synagogues, which usually point in direction of the city Jerusalem, christian churches point in the direction of the rising sun. The sun is used as a symbol for Jesus Christ, who describes himself as "light of the world" in the New Testament of the Bible, John 8:12.
"I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."
The Latin word basilica (derived from Greek, Basiliké Stoà, Royal Stoa) was originally used to describe a Roman public building (as in Greece, mainly a tribunal), usually located in the forum of a Roman town.
After the Roman Empire became officially Christian, the term came by extension to refer to a large and important church that has been given special ceremonial rights by the Pope. Thus the word retains two senses today, one architectural and the other ecclesiastical.
A cathedral is a church, usually Roman Catholic, Anglican, Oriental Orthodox or Eastern Orthodox, housing the seat of a bishop. The word cathedral takes its name from cathedra, or Bishop's Throne (In Latin: ecclesia cathedralis). The term is sometimes (improperly) used to refer to any church of great size.
A church that has the function of cathedral is not necessarily a large building. It might be as small as Christ Church Cathedral in Oxford, England, Sacred Heart Cathedral in Raleigh, United States, or Chur Cathedral in Switzerland. However, frequently, the cathedral along with some of the abbey churches, was the largest building in any region.
Old and disused church buildings can be seen as an interesting proposition for developers as the architecture and location often provide for attractive homes or city centre entertainment venues On the other hand, many newer churches have decided to host meetings in public buildings such as schools, universities, cinemas or theatres.
There is another trend to convert old buildings for worship rather than face the construction costs and planning difficulties of a new build. Unusual venues in the UK include an old Tram power station, a former bus garage, an old cinema and bingo hall, a former Territorial Army Drill Hall, and a former synagogue. A windmill has also been converted into a church at Reigate Heath.
There has been an increase in partnerships between church management and private real estate companies to redevelop church properties into mixed uses. While it has garnered criticism from some, the partnership offers congregations the opportunity to increase revenue while preserving the property.
- Architecture of cathedrals and great churches
- Architecture of the medieval cathedrals of England
- Cathedral floorplan
- Cowboy church
- Eastern Orthodox church architecture
- House church
- List of basilicas
- Lists of cathedrals
- List of highest church naves
- List of largest church buildings in the world
- List of oldest church buildings
- List of tallest church buildings in the world
- List of Unitarian, Universalist, and Unitarian Universalist churches
- Meeting house
- Palisade church
- Place of worship
- Post church
- Pub church
- Polish Cathedral style
- Stave church
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- New Advent Catholic Encyclopedia – Ecclesiastical Buildings
- New Advent Catholic Encyclopedia – The Church
- Prairie Churches Documentary produced by Prairie Public Television
- Iowa Places of Worship Documentary produced by Iowa Public Television
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