Account

The term account usually refers to the World of Warcraft subscription account of a player. Generally, an account can have up to 10 characters on each realm, with a maximum of 50 characters per account.

Special features based on registering with a Collector's Edition version, expansion upgrades (like upgrading an account for Burning Crusade) and promotional codes (like for a BlizzCon ), are associated with your account, and make those features available to all the characters under that account.

If one person logs into an account while someone else is playing a character on it, the one who was already playing will automatically get logged off from the game.

Wowpedia
On Wowpedia, an account can mean the identity you use to store your Wowpedia preferences and log into in order to make edits.