from H4549 (in the sense of flowing); abundance, i.e. (adverbially) liberally; tribute.
Usages throughout the bible
Deuteronomy 16:10
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And thou shalt keep the feast of weeks unto the LORD thy God with a tribute H4530 of a freewill offering of thine hand, which thou shalt give unto the LORD thy God, according as the LORD thy God hath blessed thee: