The quality or condition of being fruitful, productive, and abundantly beneficial.
From fructuous combined with -ness, forming an abstract noun. Standard English formation for creating nouns from adjectives describing qualities.
Fructuousness is the substantive form of productivity—it measures the actual abundance of results. Medieval farmers assessed the fructuousness of their fields by looking at stored grain; economists now use similar logic to measure productivity of industries, showing how this agricultural concept scaled upward.
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