What is the exact defination of Broadband?

It is easy to define the undefine first time, but if it has some meaning and relevance in the word itself it becomes more complex in defining it.

Broad Band Broad and Band both have the exact meanings in Oxford and Webster dictionary, for us now it is Internet Connection. But do you know that today`s Broadband was present long ago at the time of invention of cable tv. for further discussion we all could define the future defination of Broadband.