ra·di·ate • v. / ˈrādēˌāt/ 1. [tr.] emit (energy, esp. light or heat) in the form of rays or waves: the hot stars radiate energy. ∎ [intr.] (of light, heat, or other energy) be emitted in such a way: the continual stream of energy that radiates from the sun. ∎ (of a person) clearly emanate (a strong feeling or quality) through their expression or bearing: she lifted her chin, radiating defiance. ∎ (radiate from) (of a feeling or quality) emanate clearly from: leadership and confidence radiate from her.2. [intr.] diverge or spread from or as if from a central point: he ran down one of the passages that radiated from the room. ∎ Biol. (of an animal or plant group) evolve into a variety of forms adapted to new situations or ways of life.• adj. / ˈrādēət; -ˌāt/ rare having rays or parts proceeding from a center; arranged in or having a radial pattern: the radiate crown.DERIVATIVES: ra·di·a·tive / -ˌātiv/ adj. (in sense 1).