To sit upon for the purpose of hatching; hatch completely, or create by hatching: often made use of figuratively: since, to incubate eggs; to incubate a novel or a project.
to stay, as on eggs, for the purpose of hatching; brood: because, a bird that incubates for two weeks.
In pathology, to endure the phase or process of incubation. See incubation, 2.
In bacteriology, to place (a culture) in a thermostat or an equivalent equipment for the purpose of acquiring the optimum growth of micro-organisms by continuing to keep all of them at a constant optimum heat.