the state or quality of being fertile.

Biology . the ability to produce offspring; power of reproduction

the amazing fertility of rabbits.

the birthrate of a population.

(of soil) the capacity to supply nutrients in proper amounts for plant growth when other factors are favorable.

noun

aridity , childlessness , emptiness , infertility , sterility

noun

abundance , copiousness , fecundity , feracity , fruitfulness , generative capacity , gravidity , luxuriance , plentifulness , potency , pregnancy , productiveness , productivity , prolificacy , prolificity , puberty , pubescence , richness , uberty , virility , prolificness