1. the ratio of live births in an area to the population of that area; expressed per 1000 population per year
2. the state of being fertile; capable of producing offspring
3. the property of producing abundantly and sustaining vigorous and luxuriant growth
he praised the richness of the soil|weeds lovely in their rankness
4. The state or quality of being fertile or fruitful; fruitfulness; productiveness; fecundity; richness; abundance of resources; fertile invention; quickness; readiness; as, the fertility of soil, or of imagination.