the business of selling and sending goods to other countries [≠ import]
a ban on the export of toxic waste
bales of cloth for export to the continent
Export licences (=official document allowing you to sell something abroad) for arms are strictly controlled.
2 [countable usually plural]BBT
a product that is sold to another country [≠ import]:
Wheat is one of the country's chief exports.
Selling insurance overseas is Britain's largest invisible export (=a service rather than a product).