Definitions

a. An amount of money you pay regularly to receive specific items (newspapers,magazines…) : .

b. Someone who buys goods or services from a shop or a company : .

c. The process of bringing goods, letters, etc. to the person they have been sent to : .

d. Someone who sells something : .

e. It's when a customer buys products or services from the same company over a long period of time : .