a voluntary religious contribution made in addition to what may be expected or required.
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Origin of freewill offering
First recorded in 1525–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for free-will offering
Moreover, in a passage formerly quoted, it is described as a free-will-offering.The Ordinance of Covenanting|John Cunningham