One of the mysteries of the English language finally explained.
An open-air religious meeting, specifically one held by Scottish Presbyterians during the reigns of Charles II and James II & VII.
Late 17th century. From field + conventicle. Compare field preaching and discussion at conventicle, and compare also field meeting, house conventicle.
field conventicle/ˈfiːld kənˌvɛntɪkl/
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