Conventicle

A private assembly or G meeting for the exercise of religion, The word was first an appellation of reproach to the religious assemblies of Wyclitfe in the reigns of Edward III. and Richard LL., and was atterwards applied to a meeting of dissenters from the established church. As this word in strict propriety denotes an unlawful assembly, it cannot be jusily applied to the assembling of persons in places of worship licensed according to the requisitions of law.

Wharton.