USDA Meat and Poultry Labeling Terms
There is no one place to find the correct definitions. What one US agency does not define, another does. Here is the USDA page describing meat and poultry labeling terms. This only applies to meat and poultry. Here are some examples from the USDA page:
FREE RANGE or FREE ROAMING:
Producers must demonstrate to the Agency that the poultry has been allowed access to the outside.
A product containing no artificial ingredient or added color and is only minimally processed. Minimal processing means that the product was processed in a manner that does not fundamentally alter the product. The label must include a statement explaining the meaning of the term natural (such as “no artificial ingredients; minimally processed”).
For information about the National Organic Program and use of the term “organic” on labels, refer to these factsheets from the USDA Agricultural Marketing Service: