Vanilla WoW Wiki

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.[1]

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 [Murloc Costume]), 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.

In WoWWiki

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

See also