To throw rays of light upon; to illuminate; to brighten; to adorn with luster.
- To expose to radiation.
- To treat with radiation: irradiate farm produce so as to destroy bacteria.
- To shed light on; illuminate.
- To manifest in a manner suggesting the emission of light; radiate: irradiate goodness.
- Archaic To send forth rays; radiate.
- Archaic To become radiant.