birthrate, birth rate, fertility, fertility rate, natality -- (the ratio of live births in an area to the population of that area; expressed per 1000 population per year)
fertility, fecundity -- (the state of being fertile; capable of producing offspring)
richness, rankness, prolificacy, fertility -- (the property of producing abundantly and sustaining vigorous and luxuriant growth; "he praised the richness of the soil"; "weeds lovely in their rankness")
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