Initialism of combined statistical area.
"The government approved funding for all three new CSA regions in the northeastern United States."
In plain English: A CSA is a community group that pays for their local farm to deliver fresh vegetables and fruits directly to them throughout the growing season.
"The csa in our backyard provides fresh vegetables for all of us to share."
Initialism of Canadian Space Agency.
"The csa recently launched a new satellite to monitor climate change across Canada."