Noun
(1) A person who uses a computer or Internet service.
(2) A record of debits or credits, often issued periodically, that is arranged to show totals on a given date.
(3) A report describing events or the discharge of duty, especially one given to an someone in authority.
(4) An arrangement to facilitate the exchange of services or funds between a provider and a customer.
(5) Computing: An identification means for a group or individual in order to gain access to a resource.