fer·tile / ˈfərtl/ • adj. (of soil or land) producing or capable of producing abundant vegetation or crops: fields along the fertile flood plains of the river. ∎ (of a seed or egg) capable of becoming a new individual. ∎ (of a person, animal, or plant) able to conceive young or produce seed. ∎ (of a person's mind or imagination) producing many new and inventive ideas with ease. ∎ (of a situation or subject) fruitful and productive in generating new ideas: a series of fertile debates within the social sciences. ∎ Physics (of nuclear material) able to become fissile by the capture of neutrons. DERIVATIVES: fer·til·i·ty / fərˈtilitē/ n.