[Internet]. 4th Annual NIH Conference on the Science of Dissemination and Implementation: Policy and Practice [cited 30 March 2012]. Implementation science is the study of methods to promote the integration of research findings and evidence into healthcare policy and practice.
Definition. A gerund is a verbal that ends in-ing and functions as a noun. Adjective: gerundial or gerundival. The term gerund is used in traditional grammar. Many contemporary linguists prefer instead to use the term-ing form.
A gerund is simply a noun form of a verb. Or, even simpler, in most cases it's a noun that ends in -ing. (Notice that without the -ing it's just a verb.) Jenny swims. She likes swimming. <-- that second example, swimming, is a gerund because it's the noun form of a verb.