photosynthesis

Short definition from Wiktionary

Noun

1. 1
   Any process by which plants and other photoautotrophs convert light energy into chemical energy: Principally, oxygenic photosynthesis, any process by which plants and algae convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.
2. 2
   Any process by which plants and other photoautotrophs convert light energy into chemical energy: Also, nonoxygenic photosynthesis, used by purple and green bacteria, heliobacteria, and acidobacteria.