irradiationPronunciation: /ɪˌreɪdɪˈeɪʃ(ə)n/Definition of irradiation noun [mass noun] 1the process or fact of irradiating or being irradiated: ultraviolet irradiation 2 Optics the apparent extension of the edges of an illuminated object seen against a dark background. irradiation in other Oxford dictionaries Definition of irradiation in the US English dictionary
