Photosynthesis
Definition
The process by which plants take carbon dioxide from the air to build carbohydrates, releasing oxygen in the process.
Source
Baede, A.P.M. "Annex I Glossary." IPCC Fourth Assessment Report. 2007. http://www.ipcc.ch/pdf/glossary/ar4-wg1.pdf
Alternative definition
The process by which green plants and algae use the energy of light to manufacture carbohydrates from carbon dioxide and water; oxygen is given off as a by-product.
Alternative source
FAO Glossary of Biotechnology for Food and Agriculture, 2001 (http://www.fao.org/biotech/index_glossary.asp?lang=en).