Gathering

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Old English gaderian, of West Germanic origin; related to Dutch gaderen, also to together.

wiktionary

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From Middle English gadering, from Old English gaderung(“gathering, assembly”), equivalent to gather +‎ -ing(verbal noun ending).

From Middle English gaderynge, equivalent to gather +‎ -ing(present participle ending).

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gathering (n.)

mid-12c., gadering, "an assembly of people, act of coming together," from late Old English gaderung "a gathering together, union, collection, assembly," verbal noun from gather (v.).