Wiktionary:Word of the day/2024/February 28

1. (transitive)
   1. To send out (heat, light, or some other form of radiation) in the form of rays; to radiate.
   2. (often literary or poetic) To make (someone or something) bright by shining light on them or it; to brighten, to illuminate.
   3. (technology) To apply radiation other than visible light to (someone or something).
      1. To treat (food) with ionizing radiation to destroy pathogens.
      2. (medicine) To treat (a patient, or a cancerous growth or tumour) with radiation.
   4. (figurative, often literary or poetic)
      1. To animate or enliven (one's mood, or soul or spirit).
      2. To cause (one's face) to look beautiful, happy, or lively; to light up.
      3. To decorate (a place) splendidly.
      4. To enlighten (someone, their mind, etc.) intellectually or spiritually; to illuminate, to shed light on.
      5. To send out (something) as if in the form of rays; to diffuse, to radiate, to shed.
   5. (obsolete, figurative) To influence (something) as if with rays of heat, light, etc.
2. (intransitive, often literary or poetic)
   1. To become bright; to brighten, to light up.
   2. Often followed by on or upon: to emit rays of light; to shine.
   3. (figurative) To emit something other than light; to radiate.
   4. (obsolete) To diverge or be sent out in the form of rays.

irradiate adj (literary or poetic)

1. Made brilliant or bright; irradiated, illuminated.
2. (figurative) Made splendid or wonderful.