An exact statement or description of the nature, scope, or meaning of something: our definition of what constitutes poetry.
Gallery
A feature introduced with WordPress 2.5, that is specifically an exposition of images attached to a post. In that same vein, an upload is “attached to a post” when you upload it while editing a post.
Gravatar
A globally recognized avatar (a graphic image or picture that represents a user). A gravatar is associated with an email address, and is maintained by the Gravatar.com service. Using this service, a blog owner can configure their blog so that a user’s gravatar is displayed along with their comments.