A promotional rate refers to a temporary or special price or discount offered for a product or service. It is a way to attract customers and encourage them to make a purchase. Full definition
The 0 % APR is an introductory promotional rate for balance transfers and cash advances made during the first 90 days your account is open. (rbfcu.org)
When someone opens an account, she also has the opportunity to use a special low promotional rate on balance transfers made during the first 60 days the account is open. (creditcardeducation.com)
Some balance transfer cards offer promotional rates starting as low as 0 % APR for 12 months or more. (freedomdebtrelief.com)