1) Community of Web journals 2) Internet terminology 
The blogosphere is made up of all blogs and their interconnections. The term implies that blogs exist together as a connected community (or as a collection of connected communities) or as a social networking service in which everyday authors can publish their opinions. Since the term has been coined, it has been referenced in a number of media and...
The large and influential network of blogs that make up the internet's blogging community.
is the term used to describe the totality of blogs on the Internet, and the conversations taking place within that sphere.
The current state of all information available on blogs and/or the sub-culture of those who create and use blogs.
Collective name for the medium of bloggers.
The blogosphere is an imaginary atmosphere in which all the nattering bloggers chatter floats around. People say things like, `the blogosphere was abuzz with talk of the Elliot Spitzer scandal.” While it’s a buzzword, you’ll find as you follow a group of people on a certain subject that the blogosphere starts to take on a certain personality....
The sum of all blogs on the Internet and the conversations taking place within those blogs, including posts and comments.
Used to describe the overall or total blogging environment on the Internet, along with all the conversations and content connected to that environment