A set of standards for growing food and raising livestock. It does not just mean "grown without artificial chemicals." Depending on where you obtain your food, the label 'organic' can mean one of three things:
1: It has been inspected and certified as being organic by a bunch of tree-hugging hippie nut jobs with no scientific background.
2: It has been inspected and certified as being organic by a profit-making (and therefore probably untrustworthy) corporation, or simply labelled organic by the person or shop selling it.
3: It has been inspected and certified as being organic by a non-profit organisation which bases its standards on the latest scientific thinking, in order to improve human and animal health and welfare, with a view towards long term sustainability in the way we eat. A good example of such a charity is The Soil Association (www.soilassociation.org).
Proper organic farming does not use artificial chemical fertilisers, instead building soil fertility through crop rotations and other SCIENTIFIC techniques, particularly the use of clover that fixes nitrogen naturally from the atmosphere using the Sun’s energy and photosynthesis.
If the government subsidised organic farming as much as it subsidised regular farming, organic fruit and veg would probably be cheaper.