(1):

(v. t.) To enlighten intellectually; to illuminate; as, to irradiate the mind.

(2):

(v. t.) To animate by heat or light.

(3):

(v. t.) To radiate, shed, or diffuse.

(4):

(a.) Illuminated; irradiated.

(5):

(v. i.) To emit rays; to shine.

(6):

(v. t.) To throw rays of light upon; to illuminate; to brighten; to adorn with luster.