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mega·church | \ ˈme-gə-ˌchərch 
\
\ plural megachurches
Definition of megachurch
: a church having an extremely large congregation
The megachurch, one of the largest in the region with roughly 5,000 attendees at its Sunday morning Post Falls worship service, is also adding a 25,000-square-foot children's ministry building, which will include a large indoor play structure …— Nicholas Deshais In little more than a decade, his ministry has grown from a living-room Bible study to a megachurch that draws about 7,600 visitors to seven campuses around Seattle each Sunday …— Molly Worthen
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Time Traveler for megachurch
The first known use of megachurch was in 1966
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