1The action or process of renewing or updating something, especially on an ongoing basis; the action or process of making something permanent or long-lasting.
The process or practice of using or providing a new loan or extending a line of credit in order to service an existing debt.
3The process or practice of extending patent protection, especially for a drug, medical device, etc., typically by making minor changes to a product whose patent is due to expire, in order to apply for a new patent for the updated product.
1970s. From evergreen + -ing.